At the northern tip of the county the East-West streets start being named as numbered avenues, starting with 65th avenue until 72nd avenue and then it stops being numbered avenues again.

Mutant, librarian, poet, union rabble rouser, dog, Ashkenazi Jewish. Neuroweird, bodyweird, mostly sleepy.
I write about transformative justice, community, love, Judaism, Neurodivergence, mental health, Disability, geography, rivers, labor, and libraries; through poetry, opinionated essays, and short fiction.
I review Schoolhouse Rock! songs at @PropagandaRock
At the northern tip of the county the East-West streets start being named as numbered avenues, starting with 65th avenue until 72nd avenue and then it stops being numbered avenues again.
The inquirer did an article on this! https://www.inquirer.com/news/philadelphia/philadelphia-avenue-names-start-64th-20231201.html
I always know the Inquirer's got me when it comes to pedantic curiosities of Philly's urban environment.