McGregor is a city in Clayton County, Iowa, United States. The population was 742 at the time of the 2020 census. McGregor is located on the Mississippi River across from Prairie du Chien, Wisconsin. Pike's Peak State Park is located just south of the city. Just to the north of McGregor is the city of Marquette. The community of McGregor Heights lies in the southern parts of the city limits.
History
thumb|left|McGregor in 1870McGregor was founded as MacGregor's Landing in 1847 by Alexandar MacGregor, a descendant of Rob Roy MacGregor, and the area around MacGregor's Landing was settled by the extended family. In 1849 it was reported that the original MacGregor seal and signet were owned by Alex MacGregor. The Scots Gaelic clan seal was inscribed, "S' Riogal Mo Dhream/ Een dhn bait spair nocht", which was interpreted as "Royalty is my race / End do and spare not". The signet was a bloodstone from Loch Lomond, and was sketched by William Williams.
Since 1837, MacGregor had been operating a ferry across the Mississippi River between Prairie du Chien, Wisconsin and the present site of McGregor, Iowa. MacGregor planned the new city as a six block development, and it was quickly populated, being incorporated as McGregor in 1857. In that same year, the Milwaukee & Mississippi Railroad finished building a railroad track from Milwaukee, Wisconsin to Prairie du Chien, Wisconsin, thus connecting Lake Michigan with the Mississippi River by rail. McGregor quickly became a major commercial center, and served as a hub where grain from Iowa and Minnesota could be transported across the Mississippi and sent on to Milwaukee via railroad. For example, around 1860, Joseph "Diamond Jo" Reynolds moved to McGregor in order to establish a grain trading business, and later ran his own steam packets. The Diamond Jo office building still stands in the city. More railroads were built to connect McGregor with cities further west, and the city of North McGregor (now Marquette, Iowa) was established just north of the city to serve as the city's railroad terminus. After reaching McGregor from the west, trains were disassembled and railroad cars were ferried across the Mississippi to continue on towards Lake Michigan.
The towns early residents made use of the bedrock to carve cellars into the soft sandstone, used for cold storage and ageing beer; as of 1997 most of the entryways are visible but inaccessible.
Geography
thumb|[[Special routes of U.S. Route 18#McGregor–Marquette business loop|US-18 / Iowa-76 run through town]]
Mc Gregor lies at the valley floor of nearly vertical sandstone bluffs; the St. Peter Sandstone and Jordan Formation.
According to the United States Census Bureau, the city has a total area of , all land.