The Johnson County Inmate Population
The Johnson County inmate population is reported through several official systems. The Johnson County Sheriff's Office runs the local jail and the public roster for people in sheriff custody. The sheriff page states that arrests made in Johnson County are brought to the Johnson County Jail, including arrests made by city police departments and other agencies inside the county. The roster also matters because a Johnson County detainee may be physically held in Washington County, Linn County, Henry County, or another jail while still listed as Johnson County custody.
Johnson County has a second detention facility that must not be blended with the jail. The Iowa Medical and Classification Center in Coralville is a state prison run by the Iowa Department of Corrections. People there are searched through the Iowa Offender Search, not the county jail roster. The local jail count rises and falls with arrests, bond orders, short jail sentences, supervision violations, transfers to prison, and the county's need to house some detainees outside Iowa City.
Johnson County Inmate Population Statistics
Johnson County posts unusually detailed jail data. The sheriff's office page lists a 92-inmate jail capacity, while the official 2024 sheriff and jail needs assessment gives a lower functional capacity limit of 65 people. The April 2026 sheriff dashboard reported an average daily population of 90, 406 total bookings, and 400 releases. March 2026 was similar, with an average daily population of 91, 375 bookings, and 392 releases.
| Measure | Figure | Source / Year |
|---|---|---|
| Average daily population | 90 | April 2026 Johnson County Sheriff dashboard |
| Functional capacity limitation | 65 | 2024 JCSO and Jail Needs Assessment |
| Total bookings | 406 | April 2026 Johnson County Sheriff dashboard |
| 2023 jail incarceration rate | About 53 per 100,000 | 2024 JCSO and Jail Needs Assessment |
The Johnson County jail statistics page is the source index for monthly dashboards, yearly summaries, jail inspections, needs assessments, fiscal summaries, and criminal justice coordinating reports. The dashboard images and PDF tables should be read as snapshots because booking and release totals change by month.
Johnson County Inmate Population Trends
The long trend is not a simple growth line. The 2024 needs assessment says total average daily population fell 24 percent from 2015 through 2023 while Johnson County's general population increased 9.3 percent. It also found a 29 percent decline in average length of stay during the same study period. The April 2026 dashboard still shows the jail operating near or above the functional capacity limit, which explains why out-of-county housing remains a practical issue for families and records users.
| Year | Average Daily Population | Notes |
|---|---|---|
| 2014 | 118 | April 2026 dashboard 12-year trend |
| 2020 | 56 | Pandemic-era low in dashboard trend |
| 2023 | 83 | 2024 needs assessment narrative |
| 2026 YTD | 86.90 | April 2026 dashboard year-to-date panel |
Who Makes Up the Johnson County Inmate Population
The Johnson County inmate population includes people awaiting trial, people serving local sentences of 364 days or less, people detained for probation or parole violations, and people waiting for transfer to the Iowa Department of Corrections, a federal facility, or another county jail. April 2026 booking data shows a broad local law-enforcement footprint. Iowa City Police Department accounted for 160 bookings, the Sheriff's Office for 126, Coralville Police for 33, University of Iowa Police for 23, and North Liberty Police for 18.
- Charge mix - April 2026 top charges included OWI first offense, public intoxication, driving while barred, OWI second offense, marijuana possession first offense, and interference with official acts.
- Age groups - April 2026 bookings were concentrated in the 18-29 and 30-39 age ranges, with both male and female bookings reported.
- Short stays - The 2025 dashboard panel reported more than 73 percent of releases or booking segments occurred within 24 hours.
- Out-of-county custody - The roster's housing field can show another county even when the person remains in Johnson County sheriff custody.
Johnson County Jail Capacity
Capacity is one of the central facts behind the Johnson County inmate population. The sheriff's public page states that the jail can house 92 inmates. The 2024 needs assessment gives a more operational view and sets the functional capacity limitation at 65 people. That distinction matters because classification, sex separation, medical needs, security status, and court status can make a jail crowded before every bed is filled. The needs assessment says crowding symptoms can begin around 85 percent of rated capacity because different groups must be separated.
Out-of-county housing is a direct result. The April 2026 dashboard states that Johnson County had spent $16.6 million on out-of-county housing since 2001. It also listed 1,211 transports in 2025, including 484 for overcrowding and 362 by court order. That is why a roster search may show JOHNSON COUNTY, WASHINGTON COUNTY, LINN COUNTY, or HENRY COUNTY in the housing field. The roster answers who is in Johnson County sheriff custody, not always who is inside the Iowa City jail building.
Laws on Johnson County Jail Data
Iowa public-records law, county policy, jail standards, and DOC statutes all shape access to Johnson County inmate population data. The Iowa Code Chapter 22 open-records law is the broad access framework for county records. Johnson County's public-records policy says requests go to the department head or custodian where the records are kept and that confidential material may be withheld or redacted under Iowa Code 22.7, 22.8, court order, or another law.
Key Statutes:
Iowa Code Chapter 22 governs public examination and copying of records held by county and state bodies.
Iowa Code 22.3 guidance explains that a lawful custodian supervises access and may charge reasonable production expenses.
Iowa Administrative Code Chapter 50 defines jail standards, inspections, classification, and housing-unit rules.
Iowa Code 904.601 governs specified public records for people committed to Iowa DOC institutions.
Search the Johnson County Inmate Population
The official Johnson County Jail Roster is the first search route for current sheriff custody and recent custody inside the roster window. It is free and does not require a login. The page inspected in June 2026 offered All and Recent Bookings views, a Name Search field, an Update Results button, a Show all charges control, and detail links for full profiles.
- Open the official Johnson County Jail Roster.
- Leave Inmate View on All, or choose Recent Bookings for recent intake activity.
- Enter name text in Name Search if the full list is too broad.
- Select Update Results and read the Date Booked, Name, Age, Date Released, Housing Facility, and Details columns.
- Use Show all charges or a row expand control to scan charges, then open the detail page for bond, cause numbers, and photo access.
| Field Label | Type | Required | Notes |
|---|---|---|---|
| Inmate View | Radio | Unspecified | All or Recent Bookings; All was checked by default in inspected HTML. |
| Name Search | Text | Optional | Accepts name text; no official wildcard rule was displayed. |
| Show all charges | Show/hide control | Optional | Expands charges for visible roster rows. |
| Details arrow | Link | Optional | Opens the public detail profile. |
Johnson County Inmate Record Fields
A Johnson County roster detail page can show more than the list view. The inspected sample included a View Photo button, date booked, housing facility, age, address, arresting agency, gender, race, ethnicity, height, weight, hair and eye color, charges, code sections, offense level, cause number, bond type or sentenced field, bond amount, and charge-release status. The cause number is the best bridge from jail custody data to court records after an arrest.
| Field | What It Shows |
|---|---|
| Date Booked | Booking date and time, with seconds on the detail page. |
| Housing Facility | Johnson County or an out-of-county jail holding the person for Johnson County. |
| Charges | Public offense descriptions with code sections and offense level when populated. |
| Bond | Bond type and amount by charge, not always a single total release amount. |
| Charge Released | Pending status or a date; it is not the same thing as a final court disposition. |
Past Johnson County Inmate Records
The live roster is not the archive for every past jail booking. The county's disclaimer, reproduced in the 2024 needs assessment, says the roster lists people currently or within the last 48 hours in custody of the Johnson County Sheriff and does not include juveniles. For older jail public-information checks, the Sheriff's Records Division checks Johnson County Jail public information records by written request or in person. The check provides date of arrest, arresting agency, and charges only. It does not provide disposition.
Records checks require full name and date of birth. The fee is $5 per searched request, and additional names on the same person count separately. The Records Division page says no fax or phone records-check requests are accepted. Mailed requests need payment and a self-addressed stamped envelope. Broader records can be requested through the Johnson County public-records request process, where staff time, copies, attorney review, postage, and data work may create charges.
Johnson County Jail vs State Prison
Johnson County has both a local jail and a state prison, so the right search system depends on custody type. County jail records cover arrest intake, pretrial custody, local sentences, bond fields, and recent release data. Iowa DOC records cover sentenced prison custody, parole or community-corrections status, prison location, and prison intake. A male defendant sentenced to Iowa prison may be processed through IMCC in Coralville before moving to a permanent facility.
| Johnson County Jail | Iowa DOC / IMCC | |
|---|---|---|
| Who Is Held | Pretrial detainees, local sentences, holds, and people awaiting transfer | Sentenced state prisoners and prison intake/classification cases |
| Run By | Johnson County Sheriff's Office | Iowa Department of Corrections |
| Where to Look | Johnson County Jail Roster | Iowa Offender Search |
| Update Limits | Frequent roster updates, but current and recent sheriff custody only | DOC says weekly updates, with transport updates generally appearing after a move is completed |
State and Federal Inmate Search
Use the Iowa Offender Search when the person has moved from Johnson County jail custody into state prison or community corrections. Search fields include first name, middle name, last name, offender number, sex, location, offense, county of commitment, and name-search type. The location dropdown includes Iowa Medical & Classification Center, and county of commitment includes Johnson.
Federal and immigration custody are separate. The BOP inmate locator covers federal inmates incarcerated from 1982 to the present. Federal pretrial custody questions may route through the U.S. Marshals Service Southern District of Iowa. Immigration detention uses the ICE Online Detainee Locator System, by A-number and country or by biographical search. Iowa VINE remains the notification route for custody and case status alerts.
Johnson County Detention Facilities
The Johnson County inmate population is anchored by two facilities with different systems and purposes. The county jail is the local arrest and pretrial custody point. IMCC is a state prison and reception center. Current jail lookups and prison lookups must be kept separate.
- Johnson County Jail - sheriff-run county jail for people arrested in Johnson County, local sentences, bond holds, and Johnson County detainees sometimes housed outside the county jail building.
- Iowa Medical and Classification Center - Iowa DOC state prison in Coralville for male reception/classification, medium-security population, medical and psychiatric beds, and the state's licensed forensic psychiatric hospital.
Johnson County Inmate Population FAQ
How large is the Johnson County inmate population? The April 2026 jail dashboard reported an average daily population of 90 at the county jail. The sheriff page lists 92 as stated capacity, while the 2024 needs assessment sets functional capacity at 65.
Why does the roster show another county? Johnson County may house detainees in nearby jails when the Iowa City facility is over its functional limit. The person can still be in Johnson County sheriff custody.
Where are court dates and case filings? Jail staff cannot provide court information. Use Iowa Courts Online for public docket access and courthouse public terminals for public case documents.
Is there a sheriff app for inmate lookup? No official Johnson County Sheriff roster app was located. JoCo Iowa Ready and Smart911/Alert Iowa are emergency and preparedness tools, not jail lookup apps.