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Day & Zimmermann: answer block for /companies/day-zimmermann/

Answer-first block for the Day & Zimmermann company page: cleared federal staffing, Philadelphia, PA.

EDEditorial team Updated October 19, 2026 1 min read

Day & Zimmermann, also written Day and Zimmermann or DZ Atlantic, is a large Philadelphia, PA company founded in 1901. Its Federal Workforce & Staffing Services Group supplies security-cleared personnel to government contractors in engineering, IT, intelligence analysis, linguistics and logistics, from more than 150 locations worldwide.

| Company | HQ | Specialty | Regions | Size | Verified | |---|---|---|---|---|---| | Day & Zimmermann | Philadelphia, PA | GovCon Recruiting, DoD Contract Staffing | CONUS, Global/OCONUS | Large | Yes | | SOC LLC (Day & Zimmermann company) | Chantilly, VA | WPS & Security, DoD Contract Staffing | Middle East, CONUS, Global/OCONUS | Large | Yes |

Clearances it works with: Secret, Top Secret, TS/SCI, and counterintelligence and lifestyle polygraph. Source: company website, dayzim.com.

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