William H. VanderHeyden House

Ionia ( eye-OH-nyə) is the largest city in, and the county seat of, Ionia County, Michigan, United States. The population was 13,378 at the 2020 census. Every July it hosts what is said to be the world's largest free-admission fair, the Ionia Free Fair. The city is mostly within Ionia Township, with small portion extending into Easton Township and Berlin Township, but is politically autonomous of the townships. The city is named after Ionia, a historic region in Greece.

The 'Ionia Downtown Commercial Historic District is a primarily commercial district located roughly along West Main and Washington Streets, from Dexter Street to Library Street, in Ionia, Michigan. The district was listed on the National Register of Historic Places in 1984.

The Lovell-Webber House was a private house located at 111 East Main Street in Ionia, Michigan. It was listed on the National Register of Historic Places in 1974. It has been demolished.

The Ionia County Courthouse is a government building located on East Main Street in Ionia, Michigan. It was listed on the National Register of Historic Places in 1979.

The Hall-Fowler Memorial Library, also known as the Frederick Hall House, is a former mansion located at 126 East Main Street in Ionia, Michigan. It now houses the Ionia Community Library. It was listed on the National Register of Historic Places in 1971, and is part of the Historic American Buildings Survey.

The Ionia Historic District is a primarily residential historic district in Ionia, Michigan, roughly bounded by Summit, Pleasant, Jefferson and Main Streets. It was listed on the National Register of Historic Places in 1984.

The John C. Blanchard House was built as a private house located at 253 East Main Street in Ionia, Michigan. It was listed on the National Register of Historic Places in 1974. As of 2018, it serves as the museum for the Ionia County Historical Society.

The Ionia Correctional Facility (ICF), also known as "I-Max" after its maximum security housing units, is a U.S. state prison located in Ionia, Michigan. The prison was opened in 1987 and consists of five maximum security level V housing units and two medium security level II housing units. It is one of four maximum security men's prison facilities in Michigan, along with Marquette Branch Prison in Marquette, Alger Correctional Facility in Munising, and Baraga Correctional Facility in Baraga. (The Standish Maximum Correctional Facility in Standish was a fifth maximum security men's prison until its closure in 2009 eliminating 604 Level V security beds.) Although the Ionia Correctional Facility was once the state's only supermax prison, Michigan downgraded the facility from a level VI (or supermax) to a level V maximum security prison in 2004.Three of the level V housing units are designated 'general population'. The remaining two are used for administrative segregation (a unit in which prisoners are confined to their cells for breaking prison rules), temporary segregation, detention, and secure outpatient treatment. The level II facility consists of a 280-bed building separated into two units. Level II prisoners have access to a variety of recreational activities and are allowed to work in the prison and for Michigan State Industries, a factory that employs low-risk prisoners.

WION (1430 kHz, "I-1430") is a commercial full-service AM radio station licensed to serve Ionia, Michigan. The station is owned by Packer Radio WION, LLC and features a mix of locally programmed music, news, and sports. WION transmits in C-QUAM AM stereo.

Bellamy Creek Correctional Facility (IBC) is a prison in Ionia for men, run by the Michigan Department of Corrections.

The Richard A. Handlon Correctional Facility (MTU), located in Ionia, Michigan, named after the prison's first warden, is a facility for male offenders who are, on average, younger than most other prisoners.

Ionia County ( eye-OH-nyə) is a county located in the U.S. state of Michigan. As of the 2020 census, the population was 66,804. The county seat is Ionia. The Ionia County Courthouse was designed by Claire Allen, a prominent southern Michigan architect. Ionia County is part of the Grand Rapids-Kentwood metropolitan statistical area.