Of course, those numbers don't reflect what's going on in all settings. According to the 2e Forgotten Realms Adventures book, the city of Arabel has a total population of 24,600 people.
Going by the World Builder's Guidebook, we'd expect there to be, say, 1,845 NPC's with class levels in that bunch, with 923 1st-levels, 461 2nd, 231 3rd, 115 4th, 58 5th, 29 6th, 14 7th, 7 8th, 3 9th, 2 10th, and one 11th level (roughly, I'm rounding up the fractions).
What's really there? The named NPC's are:
Myrmeen Lhal, Ranger 12
Baron Thomdor, Fighter 17
Duthar, Fighter 11
Jestra, Wizard 18
Mellomir, Wizard 27 (!)
Myschanta, Wizard 14
Theavos, Wizard 17
Daramos Lauthyr, Priest of Tymora 11
Asgetrion, Fighter 1
Blaskin "The Bold", Fighter 1
Doust Sulwood, Priest of Tymora 9
Elmdaerle, Wizard 2
Islif Lurelake, Fighter 9
Khelve, Fighter 2
Peraphon of the House of Thond, Fighter 3
Thurbrand, Fighter 8
Westar, Fighter 5
Also there's garrison of 2,020 Purple Dragons, 2000 militia (with 220 serving as the city watch), and the Red Raven Mercenary Company (110 swords strong).
From what has been said of the Purple Dragons, the first-rank "Blades" are all 1st level Fighters after completing their training. The second rank "First Swords" are 4th-level, the third rank "Swordmajors" are 7th-level. There should be one 4th-level First Sword for every 10 Blades, and general officers are at least 10th-level.
However, to be fair, Cormyr's military has always been kind of ridiculous, without even getting into the War Wizards.