John G. Wallenmeier was born in Buffalo, New York on October 10, 1862, and grew up in the town of Tonawanda.

[1] In 1896, he supported William McKinley for President at the Republican New York state convention against the majority led by Thomas C. Platt who supported Levi P. Morton.

After McKinley's election, he was appointed Postmaster of Tonawanda.

[1] He was an alternate delegate to the 1904 Republican National Convention.

He was New York State Treasurer from 1905 to 1906, elected in 1904, but was defeated for re-election in 1906 by Democrat Julius Hauser.