U.S. Federal Route 51 is the main north-south route through the center of Macon County. Through out Macon County, U.S. Rt. 51 is either a four-lane highway or control access highway. This route by-passes Decatur to the west of town. U.S. Rt. 51 passes through the following towns in Macon County. Maroa
Forsyth
Harristown
Decatur
Macon
U.S. Rt. 51 is multi-plexed in Macon County. Interstate 72, around Decatur.
U.S. Rt. 51 intersects the following highways in Macon County. Interstate 72, at Forsyth. BUSN. U.S. Rt. 51, at Forsyth.
Branches of U.S. Rt. 51 in Macon County. SB U.S. Rt. 51 at the De Witt/Macon County Line. (December, 2024) NB U.S. Rt. 51 north of Maroa. SB U.S. Rt. 51 at Maroa. NB U.S. Rt. 51 at Maroa. SB U.S. Rt. 51 south of Maroa. A Macon County mile marker on U.S. Rt. 51. A street sign on U.S. Rt. 51 north of the Decatur Metro. SB U.S. Rt. 51 north of Forsyth. NB U.S. Rt. 51 north of Forsyth. (September, 2011) NB U.S. Rt. 51 north of Forsyth. (April, 2022) NB U.S. Rt. 51 north of Forsyth. (July, 2024) SB U.S. Rt. 51 at the north end of Forsyth. NB U.S. Rt. 51 at Cox Street in Forsyth. A BGS on SB U.S. Rt. 51 at I-72/BUSN. U.S. Rt. 51 in Forsyth. A BGS on SB U.S. Rt. 51. A BGS on WB I-72. A BGS on WB I-72. A BGS on EB I-72/NB U.S. Rt. 51. A BGS on EB I-72/NB U.S. Rt. 51. EB I-72/NB U.S. Rt. 51 at the U.S. Rt. 51/BUSN. U.S. Rt. 51 interchange in Forsyth. A BGS on WB I-72. A BGS on WB I-72. WB I-72/SB U.S. Rt. 51 near Forsyth. BGS on SB IL St Rt 121 at I-72/U.S. Rt. 51. Overhead signs on EB I-72/NB U.S. Rt. 51 at IL St Rt 121. A BGS on EB I-72/NB U.S. Rt. 51. EB I-72/NB U.S. Rt. 51 at IL St Rt 121. A BGS on WB I-72/SB U.S. Rt. 51. WB I-72/SB U.S. Rt. 51 near U.S. Rt. 36. EB I-72/NB U.S. Rt. 51 north of east U.S. Rt. 36. A BGS on WB U.S. Rt. 36. A BGS on EB I-72/U.S. Rt. 36. A set of BGS's on EB I-72/U.S. Rt. 36. A BGS on EB I-72/U.S. Rt. 36. A BGS on EB I-72/U.S. Rt. 36. A BGS on EB I-72/U.S. Rt. 36. A BGS on EB I-72/U.S. Rt. 36. SB U.S. Rt. 51 south of I-72/U.S. Rt. 36. NB U.S. Rt. 51 on the southwest side of Decatur. A BGS on SB IL St Rt 48 at U.S. Rt. 51. NB U.S. Rt. 51 north of IL St Rt 48. A junction marker on NB IL St Rt 48. SB U.S. Rt. 51 south of IL St Rt 48. A BGS along BUSN U.S. Rt. 51, near Elwin. A BGS on NB BUSN U.S. Rt. 51. A set of guide markers on NB BUSN U.S. Rt. 51. A BGS on NB BUSN U.S. Rt. 51. SB U.S. Rt. 51 near BUSN. U.S. Rt. 51, south of Decatur. SB U.S. Rt. 51 at the merge of traffic from SB BUSN. U.S. Rt. 51. SB U.S. Rt. 51 south of Decatur. NB U.S. Rt. 51 near Elwin. Overhead sign for NB traffic on U.S. Rt. 51 south of Decatur. SB U.S. Rt. 51 near the Shelby/Macon County Line. This is the first indication of further up-grades to U.S. Rt. 51. Photo taken in 2003. The U.S. Rt. 51 expressway is now complete into Christian County. For more pitures see U.S. Rt. 51 in Shelby County. This is the sign that was posted on SB U.S. Rt. 51 near the Shelby/Macon County Line as work was being done on a by-pass around Moweaqua. The sign was pictured in 2003, and does not stand anymore. NB U.S. Rt. 51 near Elwin. SB U.S. Rt. 51 south of BUSN U.S. Rt. 51. SB U.S. Rt. 51 near Macon.
