SR 203 in rural western Marion County, looking south from the SR 95 intersection
State Route 203 (SR 203, OH 203) is a 22.14-mile (35.63 km) long north–south state highway in the central portion of the U.S. state of Ohio. The southern terminus of SR 203 is at a four-way stop intersection with SR 37 just 0.50 miles (0.80 km) northwest of the city limits of Delaware. Its northern terminus is at SR 309 approximately 4 miles (6.4 km) northwest of Marion.
^Ohio Department of Transportation. "Technical Services Straight Line Diagrams: SR 203, Delaware County" (PDF). Archived from the original (PDF) on 2012-05-07. Retrieved 2011-08-11.
^Ohio Department of Transportation. "Technical Services Straight Line Diagrams: SR 203, Delaware County" (PDF). Archived from the original (PDF) on 2012-05-07. Retrieved 2011-08-11.
^Cite error: The named reference ODOT1922_map was invoked but never defined (see the help page).
^Cite error: The named reference ODOT1923_map was invoked but never defined (see the help page).
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