Looking for a cheap apartment for rent in Washington County, WI? With RENTCafé, finding an affordable apartment in Washington County, WI has never been easier. We feature 1 low-priced rental directly from property managers, with rents lower than the Washington County, WI average. What is a cheap rent in Washington County, WI? The average apartment rent in Washington County is $899 per month so any rental south of $719 would be considered cheap here. Size matters though, so if you are in a market for a studio, expect to pay around $385 per month. If you’re looking to upgrade to a 1-bedroom apartment you’ll pay around $506, while a cheap 2-bedroom apartment will cost you about $679 per month.