Harris prepared to locate to Texas at the urging of
Moses Austin. To prepare for this gamble, he resettled his family in upstate New York. In 1823, he sailed his boat from
New Orleans to
Buffalo Bayou, where he scouted locations for a trading post. Harris was granted a
league of land at Buffalo Bayou on August 16, 1824. He contracted for a town plat of Harrisburg in 1826, while he established a trading post and a grist mill there. He named the new town for
Harrisburg, Pennsylvania, the namesake of his great-grandfather. In addition to the grist mill, he ran a saw mill with the assistance of his two brothers, David Harris and William Plunkett Harris, and his business partner,
Robert Wilson. They also offered carpentry and blacksmithing services. Harris and Wilson managed a small fleet of sailing ships, which imported trade goods from the United States and Mexico, and exported cotton and lumber. John Richardson and David Harris founded a second trading post at
Bell’s Landing, Texas. ==Death and legacy==