Farnhamville is a city in Calhoun and Webster counties in the U.S. state of Iowa. The population was 383 at the time of the 2020 census. Farnha…Farnhamville is a city in Calhoun and Webster counties in the U.S. state of Iowa. The population was 383 at the time of the 2020 census. Farnhamville was platted in 1881 under the name Farnham, named in honor of R. E. Farnham, a railroad official. Postal authorities refused to accept the name Farnham, so town was renamed Farnhamville when the post office opened later in 1881. Farnhamville was incorporated as a city in 1892.