Old State Capitol State Historic Site in the context of Greek Revival

Springfield is the capital city of the U.S. state of Illinois. Its population was 114,394 at the 2020 United States census, which makes it the state's seventh-most populous city, the second-most populous outside of the Chicago metropolitan area (after Rockford), and the most populous in Central Illinois. Approximately 208,000 residents live in the Springfield metropolitan area, which consists of all of Sangamon and Menard counties. The city lies in a plain near the Sangamon River north of Lake Springfield. Springfield is the county seat of Sangamon County and is located along historic Route 66.

Springfield was settled by European-Americans in the late 1810s, around the time Illinois became a state. The most famous historic resident was Abraham Lincoln, who lived in Springfield from 1837 until 1861, when he became President of the United States. Major tourist attractions include multiple sites connected with Lincoln, such as the Abraham Lincoln Presidential Library and Museum, the Lincoln Home, the Old State Capitol, the Lincoln-Herndon Law Offices, and the Lincoln Tomb. Largely on the efforts of Lincoln and other area lawmakers, as well as its central location, Springfield was made the state capital in 1839.

The Lincoln-Herndon Law Offices State Historic Site is a historic brick building built in 1841 in the U.S. state of Illinois. It is located at 6th and Adams Streets in Springfield, Illinois. The law office has been restored and is operated by the Illinois Historic Preservation Agency as a state historic site.

The office building is a surviving portion of what was the Tinsley Block, a brick structure built by local developer Seth M. Tinsley in 1840–1841 to provide office space for professionals working in the newly chosen state capital city. The Illinois General Assembly had moved the capital from Vandalia, Illinois to Springfield in late 1839, and local workers had begun to build a new limestone state house, now the Old State Capitol State Historic Site, on the parcel of land just north of the Tinsley Block.