[5] According to the United States Census Bureau, the city has a total area of 2.24 square miles (5.80 km2), all land.

Chase of Decorah purchased land in the southwest part of the tract and in the spring of 1856 platted the present City of Osage.

Dr. Chase built an elaborate residence and office on Free Street in 1869.

City Hall occupies the former Sage Library Building constructed in 1910 after a $10,000 gift from Andrew Carnegie.

[15] A Subway sandwich shop occupies the ground floor of the building today and the date of 1876 along with “Sage Library” is seen in the concrete and brick work of the second story.

On both sides of Main Street within the district, one to multi-story masonry commercial buildings stand which were constructed in the late nineteenth to early twentieth centuries.

(There are a few vacant lots and some newer buildings as a result of demolition and fire.)

Since that time, it was repaved in 1975 and decorative sidewalks were built and trees planted in street boxes.

[16] Cedar River Complex - The Cedar River Complex (CRC) is a community recreation destination that includes an events center, wellness center, museum and auditorium.

Located in Mitchell County, Iowa, the Cedar River Complex is a multi-faceted recreation facility which includes an events center, a wellness center, the Mitchell County Historical Museum and an auditorium.

The 44 by 132 foot building was designed and built as a state-of-the-art theater and included 580 seats and living quarters upstairs for the Watts family.

In 1994 Paul and Gloria Bunge purchased the building (which had been closed and stripped of all its equipment and seating) and restored it to its previous glory, including new heating and air conditioning, new projection equipment and a new sound system.

The Bunges widened the aisles, left more room between rows, and installed 364 new seats designed for the building.

The Williams family made several improvements to the theatre, including a new roof, a replacement neon system, equipment upgrades, and a complete refurbishing of the apartment (which is now used as a viewing room and party facility).

Originally a private park along the Cedar River, the property was deeded to the City of Osage in 1938.

Best known for its encased spring, the park is used as a picnic, playground, and popular primitive camping area.

The community formerly had Sacred Heart School, of the Roman Catholic Archdiocese of Dubuque, which opened in 1957.