The districts of RomeThe districts of Rome are 22; Prati is the last district to have been established and the only one to be outside the Aurelian Walls.
The complete list of districts, in order of number, is as follows:

I Monti

II Trevi

III Colonna

IV Campo Marzio

V Ponte

VI Parione

VII Regola

VIII Sant'Eustachio

IX Pigna

X Campitelli

XI Sant'Angelo

XII Ripa

XIII Trastevere

XIV Borgo

XV Esquilino

XVI Ludovisi

XVII Sallustiano

XVIII Castro Pretorio

XIX Celio

XX Testaccio

XXI San Saba

XXII Prati