How to Look Up Nassau County Jail Population Data
There is no single Nassau dashboard to open. The official county sources reviewed here do not publish a current jail population page with average daily population, demographics, or a trend chart. That shapes where the numbers come from. For Nassau-specific figures, the realistic sources are county budget documents, state oversight reports, and records requests to the Sheriff. For broad context, national data comes from the federal Bureau of Justice Statistics and research groups like the Vera Institute.
So a population lookup is part request and part reading. A person decides whether they need a hard county number, which usually means a FOIL request, or a general sense of scale, which national reports can give. This page sticks to what the official record supports and flags clearly when a figure would have to be requested rather than read off a public page.
Nassau County Jail Capacity Overview
Nassau holds its county detainees at the Correctional Center in East Meadow. The facility table below lists what the official sources confirm. The rated capacity was not published in the county sources reviewed here, so it is marked as such rather than guessed.
| Facility | Address | Phone | Capacity |
|---|---|---|---|
| Nassau County Correctional Center | 100 Carman Avenue, East Meadow, NY 11554 | 516-572-4100 | Not published in reviewed sources |
The New York State Sheriffs' Institute lists Nassau and names the county sheriff, a useful starting point for confirming who runs the jail. The image below opens that listing.
Capacity is one number worth requesting directly. A jail's rated capacity sets the baseline that average daily population is measured against.
Average Daily Population
Average daily population, or ADP, is the workhorse jail metric. It is the mean number of people held per day over a set period, usually a month or a year. ADP smooths out the daily swings that come from arrests, releases, and court dates, which makes it the fairest single measure of how full a jail runs.
Nassau's current ADP was not found on the official pages reviewed here. A reliable figure comes from a county budget document or a FOIL request to the Sheriff for ADP by year. Reading ADP next to rated capacity shows whether a jail is running under, at, or over its design.
Demographic Breakdown
A demographic breakdown splits the population into groups. It does not change the total, but it shows who is held. Nassau-specific demographic counts were not published in the reviewed sources, so the table below explains the categories a breakdown usually reports rather than listing figures the official record does not support.
| Category | What It Measures |
|---|---|
| Age | Distribution across age bands, including any youth in custody. |
| Sex | The split between male and female detainees. |
| Race and Ethnicity | How the population compares with the county overall. |
| Custody Reason | Held pretrial, sentenced, or on a hold for another agency. |
To get real Nassau numbers for any of these, request them from the Sheriff. The categories themselves are standard across New York county jails.
Pretrial vs. Sentenced Population
One of the most telling splits is pretrial versus sentenced. Pretrial detainees are held while a case is open, often because bail was set and not met. Sentenced people are serving a county term after a conviction. The table below defines the two groups; the Nassau-specific counts are a records-request item, not a published figure.
| Group | Who They Are | Source for Counts |
|---|---|---|
| Pretrial | Held while a case is open, often on unmet bail | FOIL request to the Sheriff |
| Sentenced | Serving a county sentence after conviction | FOIL request to the Sheriff |
| Holds | Held for another county, state, or federal agency | FOIL request to the Sheriff |
The pretrial share matters because New York's bail rules shape it. A high pretrial share usually reflects bail and case-processing patterns rather than the number of people sentenced.
Misdemeanor vs. Felony Population
Charge level also splits the count. Felony matters in Nassau usually route to County Court, while misdemeanors and violations route to District Court. A person held on a felony tends to face a longer process and a higher bail than someone on a misdemeanor, which affects how long each group stays.
Nassau does not publish a misdemeanor-versus-felony jail split on the reviewed pages. The court structure behind those charges is covered on the Supreme Court and District Court pages, which explain which court handles which level.
Mental Health and Medical Population
Jails also track health needs. A share of any county population needs mental health or medical housing, and those counts drive staffing and oversight. Nassau-specific medical and mental-health population figures were not published in the reviewed sources.
These counts tie to oversight. The Corrections Division must provide care and custody under correction law, and the state Commission of Correction reviews local jail conditions, including medical and mental-health care.
National and State Context
When county figures are thin, national data sets the scale. Jail population is often reported as a rate per 100,000 residents so counties of different sizes can be compared. Nassau, New York State, and national rates each come from a different source, and none should be mixed up with the others. The table below shows where each level's figure lives.
| Level | Where the Figure Comes From |
|---|---|
| Nassau County | County budget, Sheriff records, or a FOIL request |
| New York State | State Commission of Correction and state reports |
| National | Bureau of Justice Statistics jail reports; Vera Institute trends |
The Bureau of Justice Statistics publishes regular jail-population reports, and the Vera Institute tracks county-level incarceration trends. Use those for context, and mark clearly when a number is national rather than Nassau-specific.
Population Trends Over Time
A single number is a snapshot. A trend tells the real story. A five-year view of Nassau ADP, bookings, and releases would show whether the jail is growing, shrinking, or holding steady. That trend was not published in the reviewed sources.
To build one, request the same metric across several years and read them together. Recommended FOIL items include ADP by year, bookings by year, releases by year, the pretrial and sentenced counts, and any medical or mental-health housing counts.
Reading a trend takes care. A one-year dip can come from a policy change, a court backlog, or a single large transfer, so several years of data give a truer picture than any single point.
How to Request Nassau County Population Data
When the number is not online, a FOIL request is the tool. The Freedom of Information Law covers county agency records, including Sheriff data. Nassau runs an official web form for these requests, and the process is straightforward.
- Open the Nassau FOIL web form and select the Sheriff's Department as the custodian.
- Describe the records clearly, naming the metric and the years you want.
- Add your contact details so the agency can respond.
- Expect an acknowledgment within five business days, with an approximate date for longer pulls.
The full FOIL framework, including appeals, is covered on the public records page.
Searching for Nassau County Inmate Records by Name
This page is about population data, not individuals. To look up one person in custody by name, use the Nassau County inmate records page, which covers VINELink and the Inmate Records line.
Where the Data Comes From
The authority behind jail data runs through correction law. County jail administrators set facility rules under Correction Law § 500-j, and the Sheriff's Corrections Division must comply with that law, the Commission of Correction, consent decrees, and court mandates. The image below opens the official text of that statute.
That oversight chain is also why reliable population data exists at all, even when it is not posted online. The records are kept; they just may need to be requested.