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Founded by Jack St. Clair in 1946, today JSI continues over half a century of honesty, integrity, hard work, and utility contracting excellence. We are a third-generation family business. We continue to build a strong foundation for our employees and customers in a safe environment. JSI has trained, fully staffed crews working hard to bring you quality work on schedule and on budget. Our management team brings a combined 115 years experience to all aspects of the job, from bids and field operations to estimates and human resources. From bid to cleanup, all members of our team pride ourselves on our honesty, integrity, and quality work.

Jack St. Clair Inc Questions

The Jack St. Clair Inc annual revenue was $5 million in 2026.

Jack St. Clair Inc is based in Roanoke, Virginia.

The NAICS codes for Jack St. Clair Inc are [23, 2371, 237110, 23711, 237].

The SIC codes for Jack St. Clair Inc are [16, 162].

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