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NAICS 541330 · Engineering Services

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Engineering firm in O'Fallon, IL

7 engineering firm in O'Fallon, IL; 71 within 30 miles. Every listing checked against the issuer's record, in the published order.

  1. Quality Testing & Engineering Inc, O'falllon

    ActiveCorporation registered in SAM.gov

    O Fallon, IL

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    Proof for Quality Testing & Engineering Inc, O'falllon
    SAM.gov registration
    SAM.gov M3YVKL2HMLJ5
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jul 6, 2027
    Checked
    Oct 23, 2026
    Where
    O Fallon, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  2. Airpower Consulting, LLC

    ActiveSole proprietorship registered in SAM.gov

    O Fallon, IL

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    Proof for Airpower Consulting, LLC
    SAM.gov registration
    SAM.gov XCYJJHY9ZEG7
    Issuer
    SAM.gov
    Status
    Active
    Class
    Sole proprietorship registered in SAM.gov
    Expires
    Feb 22, 2027
    Checked
    Oct 23, 2026
    Where
    O Fallon, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  3. Burns & McDonnell

    Engineering firm

    O'Fallon, IL

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    Proof for Burns & McDonnell
    Where
    O'Fallon, IL · serves Illinois
    Phone
    (618) 632-0354
    Listing
    Built from public records. Not claimed yet, so call them directly.

  4. Quality Testing & Engineering

    Engineering firm

    O Fallon, IL

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    Proof for Quality Testing & Engineering
    Where
    O Fallon, IL · serves Illinois
    Phone
    (618) 632-9900
    Listing
    Built from public records. Not claimed yet, so call them directly.

  5. Sitton Energy Solutions

    Engineering firm

    O Fallon, IL

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    Proof for Sitton Energy Solutions
    Where
    O Fallon, IL · serves Illinois
    Phone
    (314) 309-2029
    Listing
    Built from public records. Not claimed yet, so call them directly.

  6. Engsim Corporation

    Engineering firm

    O Fallon, IL

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    Proof for Engsim Corporation
    Where
    O Fallon, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.

  7. Sitton Consulting Group, Llc

    Engineering firm

    O Fallon, IL

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    Proof for Sitton Consulting Group, Llc
    Where
    O Fallon, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.

  8. General Dynamics Information Technology, Inc.

    ActiveCorporation registered in SAM.gov

    Fairview Heights, IL · 5 mi away

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    Proof for General Dynamics Information Technology, Inc.
    SAM.gov registration
    SAM.gov ZM65JQJZTVS5
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jan 14, 2027
    Checked
    Oct 23, 2026
    Where
    Fairview Heights, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  9. Asdg Llc

    Engineering firm

    Fairview Heights, IL · 5 mi away

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    Proof for Asdg Llc
    Where
    Fairview Heights, IL · serves Illinois
    Phone
    (618) 628-0887
    Listing
    Built from public records. Not claimed yet, so call them directly.

  10. Schweitzer Engineering Laboratories

    Engineering firm

    Fairview Heights, IL · 5 mi away

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    Proof for Schweitzer Engineering Laboratories
    Where
    Fairview Heights, IL · serves Illinois
    Phone
    (509) 332-1890
    Listing
    Built from public records. Not claimed yet, so call them directly.

  11. Sears Heating And Air Conditioning

    Engineering firm

    Fairview Heights, IL · 5 mi away

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    Proof for Sears Heating And Air Conditioning
    Where
    Fairview Heights, IL · serves Illinois
    Phone
    (708) 649-0954
    Listing
    Built from public records. Not claimed yet, so call them directly.

  12. Kaskaskia Engineering Group LLC

    ActiveCorporation registered in SAM.gov

    Belleville, IL · 10 mi away

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    Proof for Kaskaskia Engineering Group LLC
    SAM.gov registration
    SAM.gov PA83BLCNV923
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jun 18, 2027
    Checked
    Oct 23, 2026
    Where
    Belleville, IL · serves Illinois
    Phone
    (618) 233-5877
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  13. Thouvenot Wade & Moerchen Inc

    ActiveCorporation registered in SAM.gov

    Swansea, IL · 6 mi away

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    Proof for Thouvenot Wade & Moerchen Inc
    SAM.gov registration
    SAM.gov VNMESHRTNLE1
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    May 15, 2027
    Checked
    Oct 23, 2026
    Where
    Swansea, IL · serves Illinois
    Phone
    (618) 624-4488
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  14. Gonzalez Companies, LLC

    ActivePartnership or limited liability partnership registered in SAM.gov

    Belleville, IL · 10 mi away

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    Proof for Gonzalez Companies, LLC
    SAM.gov registration
    SAM.gov VC19VAC54WN7
    Issuer
    SAM.gov
    Status
    Active
    Class
    Partnership or limited liability partnership registered in SAM.gov
    Expires
    Feb 3, 2027
    Checked
    Oct 23, 2026
    Where
    Belleville, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  15. Hurst-Rosche, Inc, Hurst-Rosche, Inc.

    ActiveCorporation registered in SAM.gov

    E Saint Louis, IL · 9 mi away

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    Proof for Hurst-Rosche, Inc, Hurst-Rosche, Inc.
    SAM.gov registration
    SAM.gov QTXAMSF5QLZ3
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jan 21, 2027
    Checked
    Oct 23, 2026
    Where
    E Saint Louis, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  16. Living Technical Solutions Inc

    ActiveCorporation registered in SAM.gov

    Belleville, IL · 9 mi away

    Ask it
    Proof for Living Technical Solutions Inc
    SAM.gov registration
    SAM.gov VNTHQQA663D7
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jan 22, 2027
    Checked
    Oct 23, 2026
    Where
    Belleville, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  17. Oates Associates Inc

    ActiveCorporation registered in SAM.gov

    Collinsville, IL · 7 mi away

    Ask it
    Proof for Oates Associates Inc
    SAM.gov registration
    SAM.gov Y64LNMY68NW4
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Dec 4, 2026
    Checked
    Oct 23, 2026
    Where
    Collinsville, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  18. Volkert, Inc., Collinsville

    ActiveCorporation registered in SAM.gov

    Collinsville, IL · 7 mi away

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    Proof for Volkert, Inc., Collinsville
    SAM.gov registration
    SAM.gov KSXGKMEYYVR3
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    May 13, 2027
    Checked
    Oct 23, 2026
    Where
    Collinsville, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  19. Kaskaskia-Terracon JV

    ActivePartnership or limited liability partnership registered in SAM.gov

    Belleville, IL · 10 mi away

    Ask it
    Proof for Kaskaskia-Terracon JV
    SAM.gov registration
    SAM.gov EB21ST6A8LA1
    Issuer
    SAM.gov
    Status
    Active
    Class
    Partnership or limited liability partnership registered in SAM.gov
    Expires
    Dec 11, 2026
    Checked
    Oct 23, 2026
    Where
    Belleville, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

  20. Logisticus Solutions LLC

    ActiveCorporation registered in SAM.gov

    Shiloh, IL · 6 mi away

    Ask it
    Proof for Logisticus Solutions LLC
    SAM.gov registration
    SAM.gov JE73GETCNKQ8
    Issuer
    SAM.gov
    Status
    Active
    Class
    Corporation registered in SAM.gov
    Expires
    Jul 21, 2027
    Checked
    Oct 23, 2026
    Where
    Shiloh, IL · serves Illinois
    Listing
    Built from public records. Not claimed yet, so call them directly.
    Proof → SAM.gov record

More cities in Illinois

Chicago 343Naperville 49Schaumburg 34Lisle 31Springfield 29Rockford 26Elk Grove Village 25Aurora 24Downers Grove 24Elgin 24Peoria 23Arlington Heights 16Northbrook 16St. Charles 16Champaign 15Lombard 15

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