- Sandwich Shop Restaurants, Callahan
- Savings Banks, Callahan
- Seafood Restaurants, Callahan
- Secondary Schools, Callahan
- Security Brokers & Dealers, Callahan
- Septic Tank Installation & Repair, Callahan - Septic Systems
- Septic Tank Pumping & Cleaning, Callahan - Septic Systems
- Septic Tanks & Septic Systems Contractors, Callahan - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Callahan - Wholesale, Dealers & Suppliers
- Sheriff's Department, Callahan
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- Shipping Service, Callahan
- Shopping & Shopping Services, Callahan
- Signs, Callahan
- Social Services & Welfare, Callahan
- Special Interest Schools Or Instruction, Callahan
- Specialty Communication Companies & Services, Callahan
- Specialty Stores, Callahan
- State Government, Callahan
- Substance Abuse Clinics, Callahan - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Callahan
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