Land for sale in Blair County, Pennsylvania, recently totaled around $58 million and nearly 1,000 acres. Blair County ranks 31st out of 67 counties in the Independence State for the combined amount of land currently advertised for sale. Among cities in Blair County with land and rural real estate for sale, Altoona featured the most land for sale. Blair County is the 44th biggest county (527 square miles) in Pennsylvania. It's located in the Alleghenies & Valleys Pennsylvania region of the state.