Why is it die Washingtonerin?

Washingtonerin ends in -in, and most nouns ending in -in are feminine: in a German dictionary, 88% of them take die.

All nouns ending in -in
Sense 1
die

Meaning

[1] Female person who lives in Washington (one of the many places called Washington)

[1] weibliche Person, die in Washington (einem der vielen Orte namens Washington) lebt

Examples

[1] The elegantly dressed Washingtoner took place next to the MP from New York

[1] Die elegant gekleidete Washingtonerin nahm neben der Abgeordneten aus New York Platz.

Declension

1 Singular Plural
Nominativ die Washingtonerin die Washingtonerinnen
Genitiv der Washingtonerin der Washingtonerinnen
Dativ der Washingtonerin den Washingtonerinnen
Akkusativ die Washingtonerin die Washingtonerinnen

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary