Start with the Minnesota Historical Society (MNHS). Its Gale Family Library holds the principal historical collection of Minnesota state-hospital records. Search the Society’s aggregated patient index cards first, then use the hospital-specific index, register, casebook, admission book, or finding aid for the institution and period you identify. Historical files are usually closed for 75 years after the last entry (occasionally 100 years), so access depends on the record’s date and your relationship to the patient. Records still maintained by the Minnesota Department of Human Services (DHS) follow a separate written data-request process.
What you can find, and where to begin
Minnesota state-hospital information is not held in one searchable public database. The Minnesota Historical Society (MNHS) is the principal starting point for historical patient information, while DHS and hospitals that remain in operation handle certain modern records. The Minnesota Department of Health does not have historical state-hospital records.
MNHS holdings differ greatly by hospital and by year. A date range in a hospital overview identifies the period for which MNHS has its best individual-patient information; it is not a statement that the hospital operated only during those years. Retention and destruction schedules varied, and some files were destroyed or lost. Detailed patient information is more common in earlier periods.
Use this sequence:
- Collect the patient’s admission name, variant spellings, birth details, death information, and an approximate admission date.
- Search the aggregated patient index cards at MNHS.
- Move to the relevant hospital index or finding aid if the card series does not cover the admission.
- Identify the record form you need—such as a casebook, register, commitment paper, or admission/discharge book.
- Check the closure period and gather any proof required for restricted material.
- Request copies through MNHS research services or visit the Gale Family Library.
- Use DHS’s written data-request route for records currently maintained by the department.
Prepare the information that makes a search succeed
Use the name recorded at admission
The admission name is especially important when searching for women, who may appear under a maiden name rather than a married surname. Gather every form you can document: legal name, maiden name, nicknames, initials, common misspellings, and an anglicized or alternate spelling. Do not assume the spelling on a death certificate is the spelling used by the hospital.
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Assemble dates and identifiers
- Approximate admission year or a range of years.
- Date and place of birth.
- Date and place of death, if known.
- County of residence or commitment.
- Any public-welfare number, medical-record number, case number, or Social Security number found in family papers.
- Names of relatives, a guardian, or the county agency involved in commitment.
Some hospitals arranged material by admission date instead of alphabetically. An approximate date can therefore be as useful as an exact surname. If the family story says “the 1930s,” search a broad range rather than choosing a single year.
Search the aggregated patient index cards
MNHS holds Minnesota DHS aggregated patient index cards in two broad series. The discharged series represents admissions roughly from the 1920s through the 1990s. The deceased series represents roughly the 1910s through the 1980s. Together, the series cover an approximate 1910–1990 span, but they are not a complete census of every patient or every year.
A card may provide the bridge from a person’s name to a hospital file. Depending on the card, fields can include:
- Patient name as recorded by the institution.
- Public-welfare or medical-record number.
- Date of birth.
- County of commitment or residence.
- Admission date.
- Name of hospital.
- Case number.
- Social Security number.
- Date of death.
Search the card series with spelling variants and the admission period you assembled. Record every number and date exactly as shown. A case number or medical-record number can be more useful to staff than a surname alone when you request a deeper file.
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Move from the card to the hospital-specific material
If the admission predates the relevant card series, or no card is found, use the hospital-specific index or finding aid. MNHS’s state-hospital overview identifies the institutions for which it has the best individual-patient information in particular periods:
| Hospital or institution | Next search step |
|---|---|
| Ah-Gwah-Ching | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Anoka | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Brainerd | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Cambridge | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Faribault | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Fergus Falls | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Gillette | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Glen Lake | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Hastings | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Moose Lake | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Rochester | Check the MNHS hospital overview and its finding aid for the applicable period. |
| St. Peter | Check the MNHS hospital overview and its finding aid for the applicable period. |
| Willmar | Check the MNHS hospital overview and its finding aid for the applicable period. |
The overview’s coverage dates are “best available individual-patient information” dates, not full operating histories. A hospital may have operated outside the listed span without MNHS holding comparable patient-level material for those years.
Choose the record type that answers your question
Index cards
Index cards are the orientation tool. They can identify the institution, admission date, case number, and other identifiers that let staff locate a more substantial file. They rarely substitute for the complete clinical or administrative record.
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Admission and discharge books
These books document movement into and out of an institution. Entries can include admission and discharge dates, demographic information, diagnosis, and institutional-history fields. They are useful when you need to establish that a person was present during a particular period.
Patient registers
Registers commonly combine admission and discharge information with demographic and diagnosis fields. They may provide a concise chronological record even when a casebook is missing.
Commitment papers
Commitment papers document the legal or administrative process that brought a patient into care. They can be particularly useful for identifying the county of commitment, officials, relatives, and dates associated with admission.
Casebooks
Casebooks are often the richest patient-level source. MNHS describes entries that may contain personal background, diagnosis, medical history, daily observations, and sometimes a photograph. Content varies by hospital, period, and surviving volume; the presence of a casebook series does not guarantee that every patient has an entry.
Statistical records
Statistical records summarize institutional activity or patient characteristics. They can provide context for a hospital or period, but they may not identify an individual in the detail a casebook does.
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Understand access rules before ordering
MNHS states that patient records contain private medical information and are generally restricted for 75 years from the date of the last entry in the record or file. In some circumstances, especially where sensitive or third-party information is involved, the restriction can extend to 100 years.
The clock runs from the last entry, not automatically from admission. A file opened in 1940 but updated later can therefore remain closed longer than a simple admission-year calculation suggests. Ask MNHS to assess the specific volume or file rather than assuming that an old admission is automatically open.
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Documents that may be required
For restricted material, the review process may require:
- Government-issued photo identification.
- Proof of the patient’s death.
- Proof of your relationship to the patient.
MNHS staff may need to review restricted material before supplying copies. Provide the strongest documentation you have with your request and explain any gap—for example, when a death certificate is unavailable or a relationship is documented through several records.
Request copies from MNHS when you cannot visit
MNHS offers a State Hospital Records Research Request service for researchers who cannot visit the Gale Family Library. Use the online finding aids and the Society’s research-service instructions to identify the collection, series, volume, patient name, and date range as precisely as possible.
A useful request includes:
- The patient’s name at admission and all known variants.
- Birth and death information.
- Approximate admission and discharge dates.
- Hospital name.
- Case, medical-record, or public-welfare number from an index card, if available.
- The record form sought, such as a casebook entry, commitment paper, or register page.
- Your preferred result: inspection, digital copies, or another available reproduction format.
- Documentation for any restricted-record review.
Do not request “everything” if you can identify a series and date range. A focused request helps staff distinguish the correct person when names are common and reduces the chance that a useful index reference is overlooked.
In-person research
At the Gale Family Library, bring your identification, notes on name variants, and the reference numbers you found. Begin with the index or finding aid, then ask staff which box, volume, or register contains the relevant series. Because holdings and restrictions vary, confirm access conditions before planning a trip.
Remote research
Remote service is the practical route for researchers outside Minnesota or those unable to visit. A remote request may still require staff review, especially for records within the 75-year period or the occasional 100-year period. Wait for the Society’s determination before assuming that a scan can be supplied.
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Historical MNHS collections and current DHS-held information are different systems. If the record is currently maintained by DHS, make a written request that describes the records and date range and says whether you want to inspect the material or receive copies. DHS lists [email protected] for data requests and provides a St. Paul mailing address in its request guidance.
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For a request about yourself, DHS states a response target of 10 business days after identity verification. That target applies to the department’s stated process; it does not make historical MNHS files available or override confidentiality restrictions.
In your DHS request, identify yourself, describe the subject records, give the date range, and specify inspection or copies. Follow the identity-verification instructions DHS provides. A request about another person may require additional authority or documentation.
When the hospital is still operating
Some state hospitals that remain in operation may hold their own modern records. Dates, retention practices, and request procedures vary by hospital. If MNHS’s finding aid points to a period outside its holdings, or staff identify the material as a current institutional record, contact the operating hospital using its published records procedure rather than treating the historical Society collection as the only route.
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Broaden the name search
Repeat the search under a maiden name, middle initial, abbreviated first name, phonetic spelling, and known nickname. Compare the birth date and county rather than rejecting a possible match because of one spelling difference.
Expand the admission window
Family recollections often round dates. Search several years on either side of the estimated admission, especially when the relevant hospital arranged records chronologically.
Try a different record form
An absent casebook entry does not prove that the person was never admitted. Check registers, admission/discharge books, commitment papers, and statistical records. A register entry may survive when a detailed clinical file does not.
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Confirm the institution
Names of Minnesota facilities changed over time, and families may use a later or informal name. Compare the county, admission period, and the institution listed on the index card or finding aid before requesting copies.
Account for losses and destruction
MNHS warns that retention and destruction schedules differed among hospitals. Some records were destroyed or lost, so a negative search can mean that the relevant volume did not survive rather than that no admission occurred. Ask staff whether the series is incomplete for the year you need.
How to evaluate a possible match
Use several independent fields before identifying a card or register entry as your relative. A matching surname alone is weak evidence. Compare:
- Admission name and spelling pattern.
- Birth date or approximate age.
- County of commitment or residence.
- Admission date and hospital.
- Case or medical-record number.
- Death date, when shown.
When two people share a name, the county and birth information are often the quickest discriminators. Preserve an image or transcription of the card, including its notation and numbers, so a later request can be traced back to the same entry.
Historical coverage and its limits
The aggregated card series provide a valuable map across approximately 1910–1990, but they do not establish complete coverage for every hospital or year. The discharged series is roughly 1920s–1990s; the deceased series is roughly 1910s–1980s. The hospital overview’s date ranges identify where MNHS has its best individual-patient information, not the full life of each institution.
Earlier periods may contain more detailed patient information, while later material is more likely to be restricted or held by DHS or an operating hospital. Treat every date as a guide to the surviving collection, and confirm the exact access decision with the current custodian.
Quick route comparison
| Research need | Best first route | Typical material | Access issue |
|---|---|---|---|
| Locate a historical patient and hospital | MNHS aggregated index cards | Name, birth date, county, admission date, hospital, case or record number, and sometimes death date | Card coverage is approximate and not complete for every year |
| Find an admission outside the card series | MNHS hospital-specific index or finding aid | Institutional series arranged by hospital or period | Holdings vary sharply by institution and year |
| Confirm presence and dates | Admission/discharge book or patient register | Admission, discharge, demographic, diagnosis, and institutional fields | Entries may survive without a full case file |
| Learn clinical and personal history | Casebook or commitment papers | Background, diagnosis, medical history, observations, legal or administrative details, and sometimes a photograph | Usually subject to the 75-year rule and occasional 100-year restriction |
| Order historical copies remotely | MNHS State Hospital Records Research Request service | Copies identified through finding aids and staff review | Restricted material may require identification, proof of death, and proof of relationship |
| Request current DHS-held information | Written request to DHS | Records described by you with a specified date range | Identity verification applies; DHS states a 10-business-day target for a request about oneself after verification |
A practical checklist before you submit
- Write the name exactly as it may have appeared at admission, plus variants.
- Record birth date, death date and place, county, and an admission-year range.
- Search both aggregated patient-card series when the period overlaps them.
- Note the hospital, case number, medical-record number, and every date on a matching card.
- Check the hospital-specific finding aid for earlier or non-card coverage.
- Select the record form that answers your question instead of requesting an undefined file.
- Determine whether 75 years have passed since the last entry; allow for a possible 100-year restriction.
- Prepare government photo identification, proof of death, and proof of relationship if the file is restricted.
- Use MNHS research services for historical copies and DHS’s written route for current DHS-held information.
- Keep a record of the collection, series, volume, date range, and response so future requests use the same reference.
What a realistic outcome looks like
The strongest outcome is often a chain of evidence rather than a single file: an index card identifies the hospital and case number; a register confirms admission and discharge; a commitment paper supplies legal or family context; and a casebook, when it survives and is open, adds medical history and daily observations. If one link is missing, the remaining records can still establish identity, place, and date.
Because Minnesota’s hospitals followed different retention schedules, no responsible search can promise a surviving casebook for every patient. Begin with MNHS, document the identifiers you find, and let the custodian determine whether the specific volume is open, restricted, held elsewhere, or no longer extant.
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