Route 62 was created in 1974 from the Alta Vista branch of route 61, but the two coexisted for years as separate routes. Route 62 became route 8 in 1984, then route 44 in 2017.
Route 61 was created in 1959 as an amalgamation of the Alta Vista, Carling and Coronation routes. The Elmvale branch, which continued to operate as route 61, became a peak-period route in 1984 and was renumbered as route 45 later the same year. It became route 84 in 1989 and was cancelled in 1990.
Route 60 was created in 1974 as a limited peak-period route to supplement route 62. It became route 47 in 1984 and route 82 in 1986. Route 82 was cancelled and replaced by route 41 in 2011, which became route 291 in 2017.
As for "route 23", that was the Riverview Park route which began operating sometime between 1951 and 1954. Ottawa bus routes did not have numbers until 1959, so the route "number" simply told the map user which route to look up on the back of the map.