There’s a lot of detail of this 1891 map of the Northwest Portland area now known as the Alphabet District, including Old Town/Chinatown and the Pearl District. The rail yards would eventually expand to the west but at this time they covered much of what is now the Post Office property. Note that the park blocks were bounded by “N. East Park” and “N. West Park” with “N. Eighth” to the west. Hand-lettered notations in red renumber the streets as we know them today.
(City of Portland Archives)
Vintage Portland 
It appears “A” street was mis-identified as Ash. I’m fairly certain it should be Ankeny, unless Ankeny was renamed at a later date.
The old 22X phone exchange still in use in this neighborhood (example: 227-1212 for Radio Cab) used to stand for “Couch Addition.” So Radio Cab’s number was CA7-1212, which is still painted on the side of their garage AFAIK. I wonder if people used to say “Just call Couch Addition 71212,” just like in old movies.
The CA prefix was called Capitol when I was a kid. The 28 prefix was AT or Atlantic, and I don’t remember any others.
Capitol seven, one-two-three-four
bring a Broadway Cab right to your door.