In what state? There is a Houston County in Georgia, one in Alabama, and one in Texas. Please name the state you're asking about in your question.
The largest county in Alabama is Baldwin County. The smallest county in Alabama is Etowah County. All Alabama counties must cover at least 600 square miles.
Houston County, Georgia covers an area of 380 square miles.
Jefferson County, Alabama has an area of 1,124 square miles.
Mobile County, Alabama covers approximately 1,644 square miles.
Tuscaloosa County, AL is 1,351 square miles.
It contain 679 square miles.
Clay County, Alabama, USA - 606 square miles.
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Bullock County, Alabama is 626 sq miles (1,621 km²).
Alabama is 52,419 square miles.
Alabama's water area is 1,675.01 square miles.