Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 24, 2026 and October 2, 2026.
Natrona County, Wyoming, has about 80,000 residents (2024 Census Bureau estimate), and arrests there are reported to the FBI by the Natrona County Sheriff's Office and three city agencies. An arrest leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the County Attorney files charges, a case in the District Court for Natrona County. This guide says who keeps each one, what it costs and who may see it, with the arrest counts each agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies, cities and common questions.
Related guides: Natrona County public records, Wyoming arrest records, Wyoming inmate search and Wyoming criminal records.
Who Makes Arrests in Natrona County
The Natrona County Sheriff's Office is the county agency that reports arrests to the FBI for Natrona County. It reported 182 arrests for 2025.
Arrests inside three of the county's cities are reported to the FBI by an agency of the city's own, listed here with the Census population and what each reported:
- Casper, 58,823 residents: 2,611 arrests reported for 2025.
- Mills, 4,584 residents: 263 arrests reported for 2025.
- Evansville, 2,837 residents: 63 arrests reported for 2023.
A city on that list is reported separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
How Many Arrests Each Agency Reports in Natrona County
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- Casper: 2,611 for 2025, 2,951 for 2024, 2,816 for 2023, 3,825 for 2020 and 4,989 for 2019; 2021 and 2022 are missing months.
- Mills: 263 for 2025, 278 for 2024, 269 for 2023, 266 for 2022, 175 for 2021 and 456 for 2020.
- Natrona County Sheriff's Office: 182 for 2025, 161 for 2024, 253 for 2022, 277 for 2021, 525 for 2020 and 678 for 2019; 2023 is missing months.
- Evansville: 63 for 2023, 130 for 2021, 160 for 2020 and 289 for 2019; 2022 is missing months.
Together, the three agencies with all twelve months of 2025 on file reported 3,056 arrests that year. The same agencies with both 2025 and 2024 complete reported 3,056 in 2025 against 3,390 in 2024, down 9.9 percent.
Through July 2026, the three agencies with every month so far on file reported 1,703 arrests, against 1,771 in the same months of 2025.
Booking: Where People Arrested in Natrona County Are Held
A person kept in custody after an arrest in Natrona County is held at the county jail, whichever agency made the arrest, apart from the short stay some city departments' own holding cells allow; a person cited and released at the scene is not booked at all. The jail's record of each person held, with the charges, is a public record of the arrest, and the court file takes over from there.
On an average day in 2023 the jail held about 200 people, down from about 270 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 476 beds, and it ran at 57 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
SearchSystems opened and checked the jail page of the Natrona County Sheriff's Office at warrants.natronacounty-wy.gov (page title: Sheriff Office Warrants), which answered when SearchSystems opened it on September 24, 2026.
A person sentenced to prison serves the sentence in a facility of the Wyoming Department of Corrections, whose inmate locator is at wdoc-loc.wyo.gov.
How to Find Out About an Arrest in Natrona County
For Natrona County the place to look is the case index of the District Court for Natrona County, which shows whether charges were filed and the next court date (the court records page SearchSystems verified is at natronacounty-wy.gov/89/Court-Cases).
Wyoming does not let the public search another person's statewide criminal history. The record kept by the Wyoming Division of Criminal Investigation goes to the person it belongs to and to employers and agencies the law authorizes; for everyone else the court's own case index is the public record of an arrest that led to a charge.
Getting a Copy of an Arrest Record in Natrona County
The report of an arrest is released by the agency that made it; the jail and the court hold their own records of the same event, but not the report. Under the Wyoming Public Records Act the agency must answer within 30 days at most, and it may charge the actual cost of copying.
- An arrest by the Natrona County Sheriff's Office: ask its records unit.
- An arrest in Casper, Mills or Evansville: the records unit of the agency that reports for that city; the city guides linked above name each city's records office.
- The court file of a case that was filed: the District Court for Natrona County, through the court records page at natronacounty-wy.gov/89/Court-Cases.
- Your own statewide record: a fingerprint-based request to the Division of Criminal Investigation.
Cities in Natrona County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for three of the six cities in Natrona County: Casper, Mills and Evansville. Bar Nunn, Midwest and Edgerton have no separate reporting agency in the FBI's list.
Wherever in the county the arrest happens, a person kept in custody goes to the county jail and the case goes to the District Court for Natrona County.
SearchSystems has a guide to the offices of these cities in Natrona County, with the 2024 Census Bureau population; a city with its own arrest records guide opens there:
- Casper (58,823)
Frequently Asked Questions
How many arrests are made in Natrona County each year?
Casper reported 2,611 arrests to the FBI for 2025, and the three agencies with every month of 2025 on file reported 3,056 between them.
How do I find out if someone is in jail in Natrona County?
Ask the Natrona County Sheriff's Office; its jail page SearchSystems verified is at warrants.natronacounty-wy.gov.
Where are people arrested in Natrona County booked?
Those kept in custody go to the county jail, run by the Natrona County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Natrona County?
The court files of criminal cases in the District Court for Natrona County are public and can be looked up through the court. The statewide criminal history kept by the Wyoming Division of Criminal Investigation is not public; you can get your own. The arrest report itself is released by the agency that made the arrest, under the Wyoming Public Records Act.
How do I get a copy of an arrest report in Natrona County?
From the agency that made the arrest: the Natrona County Sheriff's Office for its own arrests, or the agency that reports for the city where it happened. Under the Wyoming Public Records Act the answer is due within 30 days at most.
Is this the official Natrona County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.