From 1952 to 1963, Route 110A was an alleged numbering for East Main Street in Stratford, between Route 110 and US 1. Before that, it was called Route 8A. Since 1963, it has been part of Route 110.

It's not known if Route 110A was signed, or even if Connecticut ever considered it an official route. Here's where Route 110A has appeared:

• State highway logs: no
• ConnDOT "route changes" spreadsheet: no
• Official highway maps: no
• USGS map: yes