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Derby Police Department

City agency in Naugatuck Valley Planning Region, Connecticut, United States. Reports crime data to the FBI, and has done since 1999.

ORI: CT0003700
Type: City
County: Naugatuck Valley Planning Region
State: Connecticut (CT)
FBI reporting: Reporting since 1999-06-01
Location: 41.3235, -73.0867

Workforce

As reported to the FBI for 2025, covering a population of 13,072.

34Sworn officers

5Civilian staff

2.98Employees per 1,000 people

13,072Population served

Year	Officers	Civilians	Population served	Per 1,000
2025	34	5	13,072	2.98
2024	33	2	12,437	2.81
2023	33	2	12,382	2.83
2022	33	2	12,243	2.86
2021	34	2	12,197	2.95
2020	33	2	12,281	2.85
2019	34	2	12,468	2.89
2018	34	2	12,535	2.87
2017	34	2	12,586	2.86
2016	34	2	12,660	2.84
2015	34	2	12,735	2.83
2014	33	2	12,776	2.74

Officer and civilian counts are full-time employees as filed by the agency in its annual return. A dash means the agency did not report that figure for that year — it does not mean zero.

Assaults on officers

Officers of Derby Police Department assaulted in the line of duty, by the weapon reported, between 1995 and 2025. These are the FBI’s own weapon categories.

Weapon reported	Officers assaulted
Firearm	0
Knife or other cutting instrument	0
Hands, fists or feet	55
Other weapon	10

Year	Hands, fists, feet	Other
1995	3	0
1996	3	1
1997	2	0
1998	4	0
1999	3	0
2001	5	0
2004	1	1
2006	2	1
2007	4	0
2008	3	0
2009	3	0
2010	0	1
2011	3	0
2012	2	0
2013	1	0
2017	3	0
2018	1	0
2019	1	0
2020	1	0
2021	1	0
2022	4	4
2023	2	0
2025	3	2

Why there is no single total here. The FBI publishes two breakdowns of the same assaults — by weapon, and by how the officer was deployed — and nationally they do not agree: the assignment columns sum to 1,869,337 and the weapon columns to 1,744,852, and the two match on only 84% of rows. Police Census publishes the weapon breakdown as the FBI states it rather than picking one basis and calling it ‘the total’. The file’s ‘cleared’ column is not shown either: it sums higher than the assaults themselves, so it is not a subset of what is above and we have not established what it counts.

This comes from the FBI’s Law Enforcement Officers Killed and Assaulted programme. Despite the name, the file carries no officers-killed data at all — those columns are empty for every agency and every year, so this page reports assaults only and says nothing about officers killed.

LEOKA identifies agencies by name, not by the ORI used elsewhere on this site. A row was attached only where exactly one agency in that state reduces to the same base name; 78.7% of rows matched nationwide. An agency with nothing here may have reported no assaults, or may be one of the names that did not match — Police Census does not guess which.

Also policing Naugatuck Valley Planning Region

Jurisdictions overlap. These agencies are also recorded against the same county, so a single address may be covered by more than one of them.

Source

Agency identity, type, jurisdiction, coordinates and reporting status are as published by the FBI Crime Data Explorer, agency record CT0003700. Police Census reproduces these values without adjustment. Where the FBI publishes nothing, this page says so rather than estimating.

Believe something on this page is wrong? Tell us — every correction is published on Corrections.