[3][4] By 1903 he was a partner in the Pomeroy Bros., a real estate firm, which by 1908 had become the Pomeroy-Guthrie Realty Co.[3][5] In 1904 he purchased an 80-acre ranch outside of Mesa.

[6] In 1924, Pomeroy ran for the Arizona House of Representatives, and defeated Republican Elijah Allen by 23 votes in a very close race.

Pomeroy ran for re-election in 1926, and won the Democrat nomination, but in a rematch with Allen, lost a very close race by 40 votes.

There was a five-man race in the Democrat primary, and initially he was declared one of the two winners, along with Joe C. Haldiman, getting the second-highest vote total.

Pomeroy ran for the Senate again in 1936, with the stated purpose of re-writing the intangibles tax to be in accordance with the guidelines set forth by the supreme court.

[21] In 1940, he uncovered the original 1863 peace treaty signed between the United States and five Indian tribes: the Maricopa, Pima, Yuma, Hualapai, and Chemehuevi.