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Eleven special routes of U.S. Route 151 exist. Three of which are located in Iowa and the other eight are in Wisconsin.
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Map of US-151 BUS, Waupun, WI 53963, USA
Cedar Rapids business loop
U.S. Route 151 Business is designated along the former alignment of U.S. Route 151 through Cedar Rapids and Marion, Iowa. US 151 Business begins at exit 248, the intersection of US 30 / US 218 and US 151 in Cedar Rapids. US 151 Business follows Williams Boulevard northeast to 1st Avenue, which it follows for the rest of its path through Cedar Rapids. 1st Avenue becomes Marion Boulevard in Marion. US 151 Business follows 7th Avenue to its northern terminus, the intersection of US 151 and Iowa Highway 13.
Through Cedar Rapids, US 151 Business is officially designated as Iowa Highway 922, though it is never signed as such.
The entire route is in Linn County.
Monticello business loop
U.S. Route 151 Business in Monticello was created in 2004 when US 151 was expanded and rerouted around Monticello. US 151 Business in Monticello begins at exit 68 of U.S. Route 151. It is co-signed with Jones County Route X44 until the Monticello city limits. In Monticello, US 151 Business follows Main Street. Between Oak Street and 1st Street, Iowa Highway 38 overlaps US 151 Business. The northern terminus of US 151 Business is an at-grade intersection with US 151.