Baldwinville was a post office established 17 Mar 1846 in the North Arm community. Pioneers settled on the North Arm of the timber in the earliest area of Edgar County by 1816, thus the name.
Same approximate site was originally established as Ono PO by Elijah AUSTIN 10 May 1831. Alanson BALDWIN was later appointed Post Master for Ono PO 18 August 1836 and ran it until it was discontinued 17 March 1846. At that time he had it renamed Baldwinville and ran it until 1864, then again in 1865-66. It served the community off and on until it was finally discontinued for good on 27 October 1873.
Site was also known as Baldwinsville, because the settlement was named for pioneer Baldwin.
Above data comes from a 32-paged book I compiled from National Archives Microfilm in 1991. My book contains maps of county showing sites of earliest villages and post offices; along with post offices, towns and city of Paris as they remain today. Lists of post offices and post masters include dates of establishment, appointments, discontinuations, name & site changes, etc.
If you are interested in obtaining a copy, please contact me directly.