If you are sending mail or packages to anywhere in Phnom Penh City, you can ensure faster and more reliable delivery by using the official area code.
| General Post Office | 12000 |
| Russei keo | 12100 |
| Phnom Penh Thmei | 12101 |
| Teuk Thlar | 12102 |
| Khmounh | 12103 |
| Russei Keo | 12104 |
| Toul Sang Kè | 12105 |
| Kilometre 6 | 12106 |
| Chrang Chamres 1 | 12107 |
| Chrang Chamres 2 | 12108 |
| Svay Pak | 12109 |
| Chroy Changva | 12110 |
| Prek Tasek | 12111 |
| Prek Leap | 12112 |
| Khan Toulkok | 12150 |
| Boeungkâk 1 | 12151 |
| Boeungkâk 2 | 12152 |
| Phsardépo 1 | 12153 |
| Phsardépo 2 | 12154 |
| Phsardépo 3 | 12155 |
| Teuk Laak 1 | 12156 |
| Teuk Laak 2 | 12157 |
| Teuk Laak 3 | 12158 |
| Phsar Doeumkor | 12159 |
| Boeungsalang | 12160 |
| Khan Daun Penh | 12200 |
| Sraas Chak | 12201 |
| Wat Phnom | 12202 |
| Phsar Chas | 12203 |
| Phsar Kandal 1 | 12204 |
| Phsar Kandal 2 | 12205 |
| Chey Chumneas | 12206 |
| Chak Tomuk | 12207 |
| Phsar Thmei 1 | 12208 |
| Phsar Thmei 2 | 12209 |
| Phsar Thmei 3 | 12210 |
| Boeung Raing | 12211 |
| Khan 7 Makara | 12250 |
| Monorom | 12251 |
| Mittapheap | 12252 |
| Veal Vong | 12253 |
| Orussei 1 | 12254 |
| Orussei 2 | 12255 |
| Orussei 3 | 12256 |
| Orussei 4 | 12257 |
| Boeung Prolit | 12258 |
| Khan Chamkarmorn | 12300 |
| Tonle Basak | 12301 |
| Boeungkengkang 1 | 12302 |
| Boeungkengkang 2 | 12303 |
| Boeungkengkang 3 | 12304 |
| Boeung Trabek | 12305 |
| Tumnup Teuk | 12306 |
| Phsar Doeum Thkov | 12307 |
| Toul Svay Prey 1 | 12308 |
| Toul Svay Prey 2 | 12309 |
| Toul Tum Poung 1 | 12310 |
| Toul Tum Poung 2 | 12311 |
| Olympic | 12312 |
| Meanchey | 12350 |
| Boeung Tumpun | 12351 |
| Steung Meanchey | 12352 |
| Chak Angré Krom | 12353 |
| Chak Angré Leu | 12354 |
| Chbar Ampeou 1 | 12355 |
| Chbar Ampeou 2 | 12356 |
| Niroth | 12357 |
| Prek Pra | 12358 |
| Dang Kor | 12400 |
| Dang Kor | 12401 |
| Trapeang Krasaing | 12402 |
| Kokroka | 12403 |
| Phleung Chhésrotés | 12404 |
| Chom Chao | 12405 |
| Kakap | 12406 |
| Porng Teuk | 12407 |
| Prey Veng | 12408 |
| Samrong | 12409 |
| Prey Sar | 12410 |
| Kraing Thnoung | 12411 |
| Kraing Pongro | 12412 |
| Prataslang | 12413 |
| Sak Sampeou | 12414 |
| Cheung Ek | 12415 |