Allegan was organized as a village in 1838 and incorporated as a city in 1907.
The city is home to 7 houses, 4 districts, chapel and a bridge, all of which have been listed on the National Register of Historic Places.
Allegan as described in 1904 
Picturesque in every sense of the word. A prosperous little city of 3,000 inhabitants, situated on the banks of the beautiful Kalamazoo River, the county seat, with fine buildings and public spirited citizens, all of which goes to make an ideal home. Our little city is beautifully situated, being surrounded by hills, and some of the handsomest scenery to be found anywhere, as the many views in this book will prove.
As a summer resort town, Allegan is fast coming to the front. A number of resorts are being established along the shady banks of the Kalamazoo — and well patronized. The Inland Lakes, near our little city, together with the beautiful Kalamazoo River, furnish fine fishing and delightful camping.
Allegan is fortunate in having several manufacturing establishments of a high class (and room for more), together with the best of railroad facilities. Allegan wants more factories — and manufacturers desirous of making a change in their location will find this an ideal spot. Our people are courteous and generous, and whether bent on pleasure or business you will always find the latch-string out, and a hearty welcome to greet you.