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|---|---|---|---|---|
| 国道503号 | ||||
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| Route information | ||||
| Length | 112.7 km[1] (70.0 mi) | |||
| Existed | 1993–present | |||
| Major junctions | ||||
| North end |   National Route 265 / National Route 315 in Takamori, Kumamoto | |||
| South end |  National Route 10 in Hyūga, Miyazaki | |||
| Location | ||||
| Country | Japan | |||
| Highway system | ||||
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This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: "Japan National Route 503" – news · newspapers · books · scholar · JSTOR (February 2023)
National Route 503 is a national highway of Japan connecting between Takamori, Kumamoto and Hyūga, Miyazaki in Japan, with total length has 112.7 km (70.0 mi).
