'J.", In general, cities located south and east of I-69 are the communities hardest hit by declining prices in southern Michigan. Trulia has heat maps that you can monitor to see the most recent information available ONLINE. This may be 6 or more months old. Here is the website for Ionia County. http://www.trulia.com/home_prices/Michigan/Ionia_County-heat_map/
A local real estate professional would be able to give you more accurate information.