GSA Guide for Domestic per Diem Rates

Note: In-State and out-of-State Travel: If the city is not listed, you may use the county of the trip destination. If the county is not listed, use the standard rate. You must indicate which rate you are using and attach a copy of the GSA per Diem Rate Sheet with the travel voucher. If you have any questions, please contact the Travel office at 361-825-5767 or 361-825-2749.

GSA - General Services Administration (US) guide for Domestic Per Diem Rates.