The people of Khorramdarreh are mainly active in the agriculture sector, and the city has an industrial estate located near the Qazvin–Zanjan highway.

[2] Khorramdarreh has the province's oldest and most significant human civilization remainders in Tappe-Khalese (Khalese Hill) from 6000 B.C.

[8] Agricultural products and fruits that are exported abroad and also distributed all over country are included and white pinto beans; varieties of grapes, raisins and grape syrup; walnuts, wheat; varieties of apple, pear, apricot, cherry, and sour cherry; cow's milk, oily seeds and meat.

Its gastronomy and restaurants (especially kabab and ab-goosht) are loved by transit drivers from Turkey, Eastern Europe, Armenia, Georgia and Azerbaijan.

Khorramdarreh's garden alleys (Koucheh-Bagh) in spring and summer host visitors from all over Iran.