Pennsylvania ED 2-503 is divided into 3 sections ED 2-503A, 20503B and 2-503C. Cedar Blvd appears to be one of the boundaries between districts, so you might have to look at all of them. If you are using the search feature, add the letter designation.
Dear Mr. Cole,
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Some Enumeration Districts were subdivided into two or more enumeration districts, usually due to size. ED 2-503 was divided by the field staff into 2-503A, 2-503B, and 2-503C. 1164 Cedar Blvd. is on 2-503A, page 33.
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Split EDs were done after the ED maps were made. It is very rare to see on the maps the splits. About 3% of the EDs in 1950 were split. Two reasons: more people in the original ED than a single enumerator could handle, thus the splits; and there might have been an institution in the original ED that required its own ED #. The original ED number once split is no longer valid. I have a YouTube video on "Invalid 1950 Census Map ED Numbers: Recognizing & Repairing" at https://youtu.be/_1fMZNL3zT4