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Products & Services
About Williamson County
Election Info Pay Your Taxes GIS Property Index Welcome to Williamson County Fast-growing Williamson County in Southern Illinois beckons travelers and visitors as a regional destination for high quality outdoor recreation, sports events, cultural attractions, family entertainment and hospitality. Located at the intersection of Interstates 24, 57 and Illinois Route 13.
Its primary NAICS classification is 921140 (Executive and Legislative Offices, Combined). Williamson County is one of 508,039 Industrial & mechanical companies listed in Illinois.
Business Contact Information
- Phone
- +1 (618) 9976541
- Website
- williamsoncountyil.gov
- facebook.com/williamsoncountyema
- Address
- 407 N Monroe St, Marion, Illinois, 62959, United States
Industry & Classification
- Industry
- Industrial & mechanical
- Sector
- Commercial services
- Segment
- Office service
NAICS Codes
- 92Public Administration
- 9211Executive, Legislative, and Other General Government Support
- 921140Executive and Legislative Offices, Combined
SIC Codes
- 91Executive, Legislative, And General Government, Except Finance
- 913Executive And Legislative Offices Combined
- 9131
Company Details
- Employees
- 24 (21-50)
- Annual Revenue
- $3.4M ($1M-$5M)
Williamson County: frequently asked questions
What does Williamson County do?
Election Info Pay Your Taxes GIS Property Index Welcome to Williamson County Fast-growing Williamson County in Southern Illinois beckons travelers and visitors as a regional destination for high quality outdoor recreation, sports events, cultural attractions, family entertainment and hospitality.
Where is Williamson County located?
Williamson County is headquartered at 407 N Monroe St, Marion, Illinois, 62959, United States.
How many employees does Williamson County have?
Williamson County has about 24 employees (the 21-50 range).
What is Williamson County's annual revenue?
Williamson County's annual revenue is estimated at $3.4M (the $1M-$5M range).
What industry is Williamson County in?
Williamson County is in the Industrial & mechanical / Commercial services industry, and its primary NAICS code is 921140 (Executive and Legislative Offices, Combined).
How can I contact Williamson County?
Its website is williamsoncountyil.gov and its phone number is +1 (618) 9976541.
Largest companies in Illinois
Largest industrial & mechanical companies
Manufacturing sales in Illinois, 2026
In Illinois, Factur's 2026 study counted 74 manufacturing quotes worth $11.8M and 14 purchase orders over 12 months: 19% of quotes became orders, against 21% nationally. See the Illinois data.
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