U.S. 321A constitutes an 11.84 mile long loop west from U.S. 321 (Hickory Boulevard) through southern Caldwell County. U.S. 321A follows Main Street north through the town of Granite Falls. Continuing north, U.S. 321A serves the town of Sawmills and the town of Hudson along Main Street. Entering the city of Lenoir, U.S. 321A lines Norwood Street between Joyceton and Whitnel. The northern leg follows Mclean Drive back to U.S. 321.
U.S. 321A previously extended another 4.0 miles north through Lenoir. The route continued along Norwood Street north to Harper Avenue west and Main Street NW through Downtown Lenoir. U.S. 321A rejoined U.S. 321 via Main Street NW on the north side of the city. This alignment included an overlap with NC 18 Business on Harper Avenue and with NC 90 north from Norwood Street to U.S. 321. The North Carolina Department of Transportation (NCDOT) application to the American Association of State Highway and Transportation Officials (AASHTO) submitted on March 24, 2006 explained:
| U.S. 321A (Norwood Street) north at Southwest Boulevard (SR 1933), an arterial bypass linking U.S. 64/NC 18 (Morganton Boulevard) with U.S. 321 (Hickory Boulevard) in Lenoir. 06/10/17 |
| U.S. 321 (Norwood Street) south at Southwest Boulevard (SR 1933) in south Lenoir. 06/10/17 |
| U.S. 321A (Norwood Street) continues south from Southwest Boulevard to Main Street through the town of Hudson. 06/10/17 |
| Southwest Boulevard (SR 1933) loops 3.85 miles southeast from U.S. 64/NC 18 (Morganton Boulevard) and Harper Avenue (SR 1300) to meet U.S. 321A (Norwood Street) in south Lenoir. 06/10/17 |
| U.S. 321A (Norwood Street) heads north to Whitnel in Lenoir and south into the town of Hudson. 06/10/17 |
| Southwest Boulevard (SR 1933) runs west from a trumpet interchange with U.S. 321 (Hickory Boulevard) along a limited access expressway 0.67 miles to U.S. 321A (Norwood Street). 06/10/17 |
| Southwest Boulevard (SR 1933) continues along a controlled access expressway from U.S. 321A (Norwood Street) northwest to U.S. 64/NC 18. 06/10/17 |
Page Updated 05-14-2021.