List of Minnesota state highways

The organized system of Minnesota State Highways (typically abbreviated as MN or TH, and called Trunk Highways), the state highway system for the US state of Minnesota, was created in 1920 under the "Babcock Amendment" to the state constitution. No real pattern exists for the numbering of highways. Route commissioning beyond these routes was by legislative action, thus the term legislative route. This included additions and revisions that took place when US and Interstate Highway Systems were commissioned.

Minnesota state highway markers use Type D FHWA font for all route numbers and type C for three-digit route markers only if type D font cannot be used. All routes except interstates use 24-by-24-inch (610 mm × 610 mm) or 36-by-36-inch (910 mm × 910 mm) markers. Interstate markers for three-digit routes are wider shields, 24 by 30 inches (610 mm × 760 mm) and 36 by 45 inches (910 mm × 1,140 mm) respectively.

Although Minnesota state highways do not follow a distinctive pattern in numbering, they are numbered to avoid conflicting with Interstate Highways and US Highways. Any instance of a state number that matches one is often a continuation of the particular route (e.g., U.S. Route 169 and Trunk Highway 169). The Minnesota Department of Transportation (Mn/DOT) does not consider this a violation of the rule.

Iowa Primary Highway System

The primary highway system makes up over 9,000 miles (14,000 km), a mere 8 percent of the U.S. state of Iowa's public road system. The Iowa Department of Transportation is responsible for the day-to-day maintenance of the primary highway system, which consists of Interstate Highways, United States Highways, and Iowa state highways. Currently, the longest primary highway is U.S. Route 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (0.43 km).

The 20th Century was a transformative time for vehicular transportation. In the early years of the century, roads were problematic at best – dusty dirt roads when dry and impassably muddy when wet. Over time, federal money was set aside and bonds were issued allowing the roads to be paved. The U.S. Highway and Interstate Highway Systems connected Iowa to the rest of the country and made national travel feasible. Periodically, new highway construction and changing driving habits have resulted in the obsolescence of local highways, to which the primary highway system has adapted. The former primary highways, turned over to counties and local jurisdictions, county highways, and farm-to-market roads make up the secondary highway system.

List of highways numbered 561

The following highways are numbered 561:

Canada

United States

MD 561

CR 561

SR 561