diff --git a/client/src/components/trans-routes/RoutesDashboard.js b/client/src/components/trans-routes/RoutesDashboard.js
index fd21264..65ba72e 100644
--- a/client/src/components/trans-routes/RoutesDashboard.js
+++ b/client/src/components/trans-routes/RoutesDashboard.js
@@ -111,6 +111,8 @@ const RoutesDashboard = () => {
   // Match route addresses against stored structured addresses without state/zip sensitivity.
   const normalizeAddressForMismatchCheck = (address) => {
     return normalizeAddress(address)
+      // Normalize unit identifiers like "Apt C-1" / "Apt C 1" to "Apt C1".
+      .replace(/([a-z])\s+(\d+)/g, '$1$2')
       .replace(/\b\d{5}(?:\s*\d{4})?\b/g, ' ')
       .replace(/\b(maryland|md|virginia|va)\b/g, ' ')
       .replace(/\s+/g, ' ')