|Administrative region||Central Macedonia|
|• Municipal unit||112.943 km2 (43.608 sq mi)|
|• Municipal unit||2,085|
|• Municipal unit density||18/km2 (48/sq mi)|
|Time zone||EET (UTC+2)|
|• Summer (DST)||EEST (UTC+3)|
|Postal code||601 00|
Pierioi (Greek: Πιέριοι) is a former municipality in Pieria, Greece. The seat of the municipality was in Ritini. Since the 2011 local government reform it is part of the municipality Katerini, of which it is a municipal unit. The 2011 census recorded 2,085 residents in the municipal unit. The municipal unit has an area of 112.943 km2.
- "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority.
- Kallikratis law Greece Ministry of Interior (in Greek)
- "Population & housing census 2001 (incl. area and average elevation)" (PDF) (in Greek). National Statistical Service of Greece.
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