Staffing agencies in Denver: the market in numbers and how to vet one in Colorado

This report is for Denver-area employers choosing an agency, recruiters and analysts sizing the local market, and B2B sellers whose customers are staffing and search firms.

Denver staffing agencies in Census data

The figures cover the Denver-Aurora-Centennial, CO Metro Area (CBSA 19740) and two industry codes: NAICS 56131 (Employment Placement Agencies and Executive Search Services) and NAICS 56132 (Temporary Help Services). The source is the US Census Bureau's County Business Patterns for 2023.

Two markets under one name

The industry rows show how different the codes are:

Temp agencies employ the people they place, so 91% of the metro's staffing headcount sits in temporary help, at about 43 employees per location. Executive search runs the other way: Denver has more search offices than placement agencies, but they average about five people each, and 102 of the 131 have fewer than five employees. If you're hiring a senior role, you're mostly choosing between small partner-led boutiques and the local offices of national firms.

How big they are and where they are

In broader bands, 466 establishments have 1 to 19 employees, 154 have 20 to 99 and 66 have 100 or more. The top three classes are withheld by the Census Bureau to protect confidentiality for the two codes combined, but the industry rows fill the gap: the 12 locations above 249 employees are all temp help branches with 250 to 499 employees, and no Denver staffing location reached 500.

Denver and Arapahoe counties together hold 441 locations and 70% of the employees, which fits the office corridor from downtown to the Denver Tech Center. Adams County has few agencies, but they're the largest, at about 40 employees per location; Douglas County's average about 18.

What these numbers leave out

County Business Patterns counts establishments with paid employees, not companies: a national agency with four Denver branches counts four times, and an independent recruiter with no payroll doesn't count, because the self-employed are excluded. Professional employer organizations (NAICS 56133, 31 more locations here) are left out, as are corporate head offices, which Census classifies separately. Employment is a snapshot of the week of March 12, before seasonal peaks, and the figures are 2023, the latest available.

Checking an agency when Colorado keeps no list

Some states register temp agencies and make clients check the list. Colorado doesn't: SB20-192, which would have required staffing agencies to register annually and employers to verify registration, was postponed indefinitely by the Senate Judiciary Committee on 26 May 2020. These are the checks that replace it:

1. Match the type to the job. Temp and temp-to-hire for shifts and seasonal peaks, placement for permanent hires, executive search for senior roles, and a PEO if you want someone to run payroll for staff you already employ.
2. Confirm the entity is in Good Standing with the Colorado Secretary of State. Status matters here: among the 330 entities in the state's business register with "staffing" in the name and a Denver principal address, 149 are Delinquent, 88 are in Good Standing and 66 have voluntarily dissolved (data updated 25 October 2026). An entity becomes Delinquent when it fails to file its periodic report or keep a registered agent.
3. Get insurance certificates for workers' compensation and general liability, and confirm the agency is the employer of record for payroll taxes.
4. Ask for the pay rate and markup separately, and whether the bill rate moves when pay does. Denver's minimum wage applies to work performed within the City and County of Denver, and it changes every 1 January.
5. Read client reviews, not just testimonials. ClearlyRated lists 201 Denver agencies with client and talent ratings; its Best of Staffing award requires a Net Promoter score of at least 50%.
6. Call two references at sites like yours, then pilot with a few workers before your peak.

For some roles you may not need an agency at all: Denver Workforce Development offers employers no-cost recruitment, candidate screening and job promotion, including 25 job fairs a year.

Worked example: a temp assignment that crosses 1 January

Illustrative example. The company and markup are invented; the wage rates are Denver's published minimums.

Sloan's Lake Provisions (sloanslake.example) packs holiday gift boxes at a plant in Denver and needs 10 packers for 14 weeks, 6 in late 2026 and 8 in early 2027, at 32 hours a week. The agency pays the Denver minimum and bills a 42% markup.

Budgeting all 448 hours at the 2026 bill rate gives $12,270.72, so the real cost is $199.68 higher per worker and $1,996.80 for the team. The reverse risk applies to the agency: a flat $28.00 bill rate is a 45% markup on $19.29 but only 41% on $19.84, which is why some agencies reprice in January. Settle which one you've agreed in writing.

Selling to Denver staffing agencies

The 457 temp help branches buy for volume: payroll and timekeeping, background and drug screening, workers' compensation, safety training and recruiting ads. The search boutiques buy candidate research, reference checks, compensation data and small-office software, and the owner usually signs.

Build the list from the ASA member directory (filter to Colorado), the ClearlyRated listings and the state business register, keeping only entities in Good Standing. Then sort temp from search by reading each firm's job postings. Time payroll and pricing pitches for August to October: Denver publishes the next year's minimum wage in August, and temp branches reprice client contracts before it takes effect. At volume the research is the slow part; Bebop finds agencies that match a description and explains why each fits. For method, see how to build a prospect list and how to find decision makers.

Subject: Reference checks for [firm]'s finalists

Hi [first name],

I saw [firm] is running searches for [role] and [role] this month. In a search firm your size, reference calls on finalists usually land on the partner running the search.

We run structured reference calls within [time] and send written notes your client can read.

Worth trying one on your next finalist?

[Your name]

Local sources

Next step: compare Denver with a fast-growing Texas market in the report on staffing agencies in Austin.