List of Private Detectives in the USA

Last updated 21 October 2026

There are 6,019 private detectives in the USA, one in every 10,611 US companies. Most of them are small: four in five have one to four people, and only 55 firms employ 50 people or more. One in twenty investigation agencies is based in Houston, Phoenix, Miami, New York and Las Vegas. Below you find the largest investigation agencies in the USA, the cities where they cluster, how many started this year and which are the oldest. The full list with addresses, phone numbers and email is in our US company database or through the Company Data API.

6,019 companies indexed · Data counted on 21 October 2026

Companies6,0191 in10,611 US companiesCities2,177Largest cityHouston 74Sole traders13%Employees1-4 (83%)Revenue< $100K (59%)Email46%Phone99%Website71%

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A live view of all 6,019 investigation agencies, sorted by revenue. Narrow it by region, city, employee size, revenue, legal form or founding year, or search a firm by name.

Coventbridge (USA) INC.Coventbridge (USA) INC.

	Company Name	Country	City	Address 1	State/Province	Postal Code	Website	Founding Year	Yearly Revenue in U.S. Dollars	Employees Total	Business Legal Type - Description	Number of Companies in Group	Company Registration Number
1	Coventbridge (USA) INC.	USA	Jacksonville	9485 Regency Square Blvd Ste 200	Duval	32225-8111	*****.com	2010	$86,666,540	781	Corporation	N/A	4830835
2	Frasco, INC.	USA	Burbank	215 W Alameda Ave	Santa Clara	91502-3060	*****.com	2024	$23,882,675	168	Corporation	16	0750380
3	Command Investigations LLC	USA	Lake Mary	1540 International Pkwy Ste 3070	Seminole	32746-4625	N/A	2025	$23,566,178	651	Corporation	8	N/A
4	Mintz Group LLC	USA	New York	116 E 16th St Fl 4	New York	10003-2165	*****.com	1992	$20,740,268	163	Corporation	12	2320778
5	Peraton Risk Decision INC.	USA	Loveland	1750 Foxtrail Dr	Larimer	80538	*****.com	1962	$20,601,351	500	Corporation	638	N/A
6	Beau Security & Investigations INC.	USA	New York	489 5th Ave Fl 16	New York	10017-6130	*****.com	1985	$12,003,702	500	Corporation	N/A	974860
7	Ethos Risk Services, LLC	USA	St. Petersburg	300 1st Ave S Ste 300	Pinellas	33701-4246	*****.com	2011	$11,836,045	168	Corporation	4	20141242794
8	Hilton Global Associates INC.	USA	Naples	365 5th Ave S	Collier	34102-6575	*****.com	2020	$10,036,280	50	Corporation	2	P20000003906
9	Armored Knights, INC.	USA	Omaha	2330 Paul St	Douglas	68102-4030	*****.com	1988	$7,083,526	55	Corporation	N/A	0951338
10	Contego Investigative Services, LLC	USA	Orlando	424 E Central Blvd Ste 417	Orange	32801-1923	*****.com	2018	$7,016,694	195	Corporation	3	4970844
11	Rocky Mountain Information Network, INC.	USA	Phoenix	2001 W Pinnacle Peak Rd	Maricopa	85027-1215	*****.com	2010	$6,707,704	50	Corporation	N/A	16156950
12	Gryphon Investigations, LLC	USA	White Plains	1 N Broadway	Westchester	10601-2310	*****.com	1989	$6,030,904	55	Corporation	N/A	133886621
13	Zane Investigations INC	USA	Sparks	9 Greg St	Washoe	89431-6277	*****.com	2013	$5,256,168	28	Corporation	N/A	E0730652005-9
14	Argus West, INC	USA	San Diego	7183 Navajo Rd Ste M	San Diego	92119-1650	*****.com	1997	$4,710,755	16	Corporation	N/A	330748313
15	Tier 1 Integrity, LLC	USA	Pasadena	312 Richey St	Harris	77506-1804	*****.com	2014	$4,661,793	165	Corporation	N/A	0801948983
16	Pinnacle Investigations CORP.	USA	Spokane Valley	920 N Argonne Rd Ste 200	Spokane	99212-2796	*****.com	2002	$4,608,019	26	Corporation	N/A	3520232
17	Corporate Resolutions INC	USA	New York	345 7th Ave Fl 10	New York	10001-5048	*****.com	1991	$4,496,032	20	Corporation	7	5457062
18	Smith & Carson, INC.	USA	Alpharetta	5755 N Point Pkwy Ste 278	Fulton	30022-1176	*****.com	1978	$4,492,982	53	Corporation	13	J200154
19	B. K. Teachout Investigations, INC.	USA	Flint	2348 Stonebridge Dr	Genesee	48532-5406	*****.com	1995	$4,472,023	600	Corporation	7	N/A
20	Information Network Associates, INC.	USA	Harrisburg	5235 N Front St	Dauphin	17110-1717	*****.com	1982	$4,455,694	150	Corporation	N/A	0000686884
21	Professional Investigating & Consulting Agency, INC.	USA	Columbus	551 S 3rd St Fl 2	Franklin	43215-5721	*****.net	1982	$4,425,391	100	Corporation	11	595157
22	Msa Investigations, INC.	USA	New York	9 Murray St Fl 3	New York	10007-2258	*****.net	2005	$4,397,896	7	Corporation	N/A	3984334
23	Piedmont Private Investigations, INC.	USA	Charlotte	8430 Medical Plaza Dr Ste 100	Mecklenburg	28262-8902	*****.com	2004	$4,206,839	21	Corporation	N/A	0718673
24	Accord Detective Agency, INC.	USA	Park Ridge	310 Busse Hwy	Cook	60068-3251	N/A	2001	$4,003,269	40	Corporation	N/A	53007147
25	Backgroundchecks.com LLC	USA	Dallas	12770 Coit Rd Ste 1150	Dallas	75251-1366	*****.com	2004	$3,630,869	70	Corporation	2	6289489

Showing 25 of 6,019 companies

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Largest investigation agencies in the USA

The biggest firms by staff and by revenue, the largest in Houston, the biggest newcomers of 2026 and the oldest firms. Click a name for the record.

Cauley Detective Agency is the largest investigation agency in the USA by headcount. 55 firms employ 50 people or more; 20 employ 100 or more.

1Pittsburgh800 staff
2Jacksonville781 staff
3Lake Mary651 staff
4Flint600 staff
5Vero Beach509 staff
6New York500 staff
7Loveland500 staff
8Harlingen463 staff
9Memphis256 staff
10Orlando200 staff

By employee size · 6,019 firms with a known headcount

Employees	Firms	%
1-4	4,995	83%
5-9	690	11%
10-19	175	3%
20-49	104	2%
50-99	35	0.6%
100-199	11	0.2%
200-499	4	<0.1%
500-999	5	<0.1%
1,000+	0	0%

83% have 1 to 4 people; 104 have 20 to 49; 55 have 50 or more.

By yearly revenue (USD)

Revenue	Firms	%
< $100K	3,460	59%
$100K-$500K	2,089	36%
$500K-$1M	176	3%
$1M-$5M	116	2%
$5M-$10M	5	<0.1%
$10M-$50M	7	0.1%
$50M-$100M	1	<0.1%

59% under $100,000; 116 between $1M and $5M; 13 above $5M.

Where in the USA?

Houston has the most private detectives in the USA (74), ahead of Phoenix (68), Miami (62), New York (58) and Las Vegas (45). Together the five hold one in twenty of them.

Cities by number of firms

2,177 US cities have at least one investigation agency; 104 have ten or more; 1,203 have exactly one. Click a city to set the lens.

By county 765 counties

County	Firms	%
Los Angeles	204	3%
Orange	176	3%
Maricopa	159	3%
Broward	96	2%
Harris	93	2%
Miami-Dade	87	1%
Cook	76	1%
Jefferson	76	1%
Suffolk	71	1%
San Diego	71	1%

Show all 765

How many private detectives are there in the USA?

Private detectives and investigation agencies in the USA

6,019

21 October 2026

There are 6,019 private detectives and investigation agencies in the USA in our data (21 October 2026). That is one in every 10,611 US companies. About one new firm is entered in the register every week this year (44 so far in 2026).

Structure

Single-site firms: 5,711 95%
Head offices: 143
Branch offices: 165

Classification

Our platform filter is SIC 7381, 7389.

3,274 of the 6,019 are corporations and LLCs (54%); 760 are sole traders. They come from the state business registers and our US register data, through the Company Data API.

Firm sizes in the USA

Of the 6,019 US investigation agencies with a known headcount, 4,995 (83%) have one to four people, 690 have five to nine, 279 have ten to 49 and 55 have 50 or more. Most firms turn over under $100,000 a year (3,460, 59%).

EU size bands · the grey line shows all US companies

Micro under 105,685 94%
Small 10 to 49279 5%
Medium 50 to 24950 0.8%
Large 250+5 <0.1%

Grey line: the share among all US companies (96% have under ten staff).

firms turn over more than $5 million a year; 8 more than $10 million.

firms were entered in 2026.

Investigation agencies in Houston

Houston has 74 private detectives and investigation agencies, <0.1% of all 881,247 Houston companies and 11% below the national share. Three in four Houston firms have fewer than five people; none has 50 or more. 2 new firms were entered in 2026, 4 date from before 1990.

Size

1-4 staff: 54 · 73%
5-9: 13 · 18%
10-19: 7 · 9%
20-49: 0 · 0%
50+: 0 · 0%

Legal form

Sole traders: 10 · 14%
Partnerships: 1 · 1%
Corporations and LLCs: 40 · 54%
Other or none: 23 · 31%

Of the US total: 1.2%
Of all Houston companies: <0.1%
Against the national share: 0.9×

New

Entered 2026 so far: 2
Entered 2025: 2
Of USA's 2026 entries: 4.5%

Old

Before 1990: 4 · 5%
1990 or later: 70 · 95%
Of USA's pre-1990 firms: 0.9%

Reachable

Email: 31 · 42%
Phone: 72 · 97%
Website: 45 · 61%

Revenue (USD)

Under $100K: 35 · 47%
$100K-$500K: 34 · 46%
$500K-$1M: 4 · 5%
$1M and more: 1 · 1%

Largest

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Sole traders or corporations: how they are organised

One in eight US investigation agencies work as sole traders, against 5% of all US companies. Half are corporations and LLCs.

Sole traders76013%
Partnerships581.0%
Corporations and LLCs3,27454%
No form on record or other1,92732%

Single-site: 95%
Head offices: 143
Branches: 165

All US companies: 5% sole traders, 1% partnerships, 68% corporations and LLCs.

The oldest firms in the USA

Our data holds 0 US investigation agencies from before 1900, 6 from before 1950 and 455 from before 1990.

1921
1. Valencia
1928
1. New York
1935
1. Boston
1937
1. Pittsburgh
1946
1. Elkton
1947
1. San Francisco

Older than you

Live tool

Move the slider to a year. Two live counts, scoped to this industry.

1990

455

US investigation agencies date from before 1990

were entered in 1990

How they compare

Next to related industries

There are 29 hairdressers for every investigation agency in the USA.

Industry	Firms	Website	1-4 staff
Hairdressers	172,870	79%	93%
Funeral Companies	43,292	69%	79%
Horticulture Companies	16,403	42%	77%
Horse Farmers	7,767	29%	94%
Private Detectives	6,019	71%	83%
Graphic Designers	5,422	80%	90%

Free sample: investigation agencies in North America

Newcomers in the USA in 2026

44 investigation agencies were entered in the US register so far in 2026, about one per week, after 59 in 2025. The USA as a whole saw 2,970,531 new companies in 2026, so this industry takes <0.1% of the inflow.

1362022
1262023
822024
592025
442026 so far

43 of this year's 44 are corporations and LLCs.

The biggest newcomers of 2026

The year is the register entry; an established firm that changes legal form appears as new.

1Mission Viejo3 staff
2Richmond Hill2 staff
3Fond du Lac2 staff
4Tysons Corner2 staff
5Royse City2 staff

How reachable are they?

Investigation agencies are easier to reach than the average US company: 99% list a phone number and 71% a website.

Email2,765 46%
Phone5,940 99%
Website4,245 71%

Grey line: all US companies (email 15%, phone 42%, website 24%).

The full list with these fields is in our US company database.

Frequently asked questions

How many private detectives are there in the USA?

There are 6,019 private detectives and investigation agencies in the USA in our data, counted on 21 October 2026. That is one in every 10,611 US companies.

Which is the largest investigation agency in the USA?

Cauley Detective Agency in Pittsburgh, with 800 staff. By revenue Coventbridge (USA) in Jacksonville leads with $86.7 million a year.

Which US city has the most private detectives?

Houston, with 74, ahead of Phoenix (68), Miami (62), New York (58) and Las Vegas (45).

How many investigation agencies are there in Houston?

74, which is <0.1% of all 881,247 Houston companies and 11% below the national share.

How big is a typical investigation agency?

Small. 83% of the 6,019 firms with a known headcount have one to four people; 55 have 50 or more. Most turn over under $100,000 a year.

Are US private detectives sole traders or companies?

One in eight (760) are sole traders, 1.0% are partnerships and 54% (3,274) are corporations and LLCs.

How many investigation agencies started in 2026?

44 were entered in the US register so far in 2026, after 59 in 2025. 43 of them are corporations and LLCs.

What is the oldest investigation agency in the USA?

Botello & Associates in Valencia, 1921, followed by Holmes Detective in New York (1928) and Simmons Agency in Boston (1935). 0 firms date from before 1900.

Which industry code covers private detectives?

Our platform filters them on SIC 7381 (detective, guard, and armored car services) and 7389 (business services, not elsewhere classified).

Can I download the full list?

Yes. All 6,019 firms with address, phone, email, legal form, employees, revenue and founding year, as Excel, CSV or through the API.

Discover more: related industries, by city

The lists closest to this one. Every industry and city in the USA is on the USA page.

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