It’s wild that two of the three biggest cities in the US have palindromic area codes to each other:
312: Chicago
213: Los Angeles
Update 20 years later: How Chicago got 3, 1, and 2 digits in their area code. This blog post explains why Los Angeles, Chicago, Detroit, and New York City all have the digits 1, 2, and 3.

and then New York is a palendrome all to itself: 212
So is Detroit, MI 313
wow, i wonder if this was intentional by the area code consortium
Take a look at http://allareacodes.com and you ll see that there are tons of area codes and that practically ever single one has a corresponding palindrome 218 in MN v 812 in IN 208 in ID v 802 in VT 609 in NJ v 906 in MI
“It’s wild that two of the three biggest cities in the US have palendromic area codes to each other” “i wonder if this was intentional by the area code consortium” 212, 213 and 312 were designed as the shortest to dial on a rotary ‘phone. The number of pulses increases as the population decreases. 907 is Alaska and 808 Hawaii (‘0’ is 10 pulses). -Duncan Hill