Explore details about location 国道４２１号. 国道４２１号 is a location situated within the いなべ市 alongside other areas such as 西野尻垣内線, 北勢多度線, 国道４２１号. Additionally, some smaller parts of 国道４２１号 include specific areas like 南中津原畑新田線, 大泉東停車場線, 大泉東停車場北大社線 adding to the diversity of its landscape.