| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 101 | Andithangal | Japthikariandal BO | 📍 606702 | Chengam | Branch Post Office |
| 102 | Angunam | Madurampattu BO | 📍 606804 | Tiruvannamalai | Branch Post Office |
| 103 | Aniyalai | Pungambadi BO | 📍 606903 | Arani | Branch Post Office |
| 104 | Aniyalai | Padagam BO | 📍 606904 | Polur | Branch Post Office |
| 105 | Anmarudai | Anmarudai BO | 📍 604504 | Vandavasi | Branch Post Office |
| 106 | Anna Nagar | Kuppanatham BO | 📍 606710 | Chengam | Branch Post Office |
| 107 | Anna Nagar | Kappalur BO | 📍 606751 | Polur | Branch Post Office |
| 108 | Annamalai kottai | Melnachipattu BO | 📍 606704 | Chengam | Branch Post Office |
| 109 | Annamalai Nagar | Kallarai Padi BO | 📍 606702 | Chengam | Branch Post Office |
| 110 | Annamalai R F | Adiannamalai BO | 📍 606604 | Tiruvannamalai | Branch Post Office |
| 111 | Annanagar Gangasoodamani | Morakaniyanur BO | 📍 606801 | Vandavasi | Branch Post Office |
| 112 | Annandal | Vasudevampattu BO | 📍 606704 | Chengam | Branch Post Office |
| 113 | Annandal | Budamangalam BO | 📍 606902 | Tiruvannamalai | Branch Post Office |
| 114 | ANSOLDA Nagar | Maruthuvambadi BO | 📍 606801 | Tiruvannamalai | Branch Post Office |
| 115 | Anthoniyarpuram | Perunthuraipattu BO | 📍 606753 | Chengam | Branch Post Office |
| 116 | Anthoniyarpuram | Valavachanur BO | 📍 606753 | Chengam | Branch Post Office |
| 117 | Anukkumalai | Neivanatham BO | 📍 606754 | Tiruvannamalai | Branch Post Office |
| 118 | Anwarabath | Munnurmangalam BO | 📍 606705 | Chengam | Branch Post Office |
| 119 | Appanthangal | Amudur BO | 📍 604405 | Vandavasi | Branch Post Office |
| 120 | Appanthangal | Velleri BO | 📍 632317 | Arani | Branch Post Office |
| 121 | Appedu | Ulagampattu BO | 📍 606801 | Polur | Branch Post Office |
| 122 | Aradapattu | Aradapattu BO | 📍 606808 | Tiruvannamalai | Branch Post Office |
| 123 | Aradrivelur | Ramakrishnapuram BO | 📍 604402 | Cheyyar | Branch Post Office |
| 124 | Araiyalam | Arayalam BO | 📍 632326 | Arani | Branch Post Office |
| 125 | Arani | Arni Fort SO | 📍 632301 | Arani | Post Office - PO |
| 126 | Arani | Arni HO | 📍 632301 | Arani | Head Post Office - H |
| 127 | Arani | Arunagirichatram SO | 📍 632301 | Arani | Post Office - PO |
| 128 | Arani | Saidapettai Arni SO | 📍 632301 | Arani | Post Office - PO |
| 129 | Arani | Mullandrum BO | 📍 632512 | Arani | Branch Post Office |
| 130 | Arani | Poosimalaikuppam BO | 📍 632512 | Arani | Branch Post Office |
| 131 | Arani | Puthur BO | 📍 632512 | Arani | Branch Post Office |
| 132 | Aranji | Somasipadi SO | 📍 606611 | Tiruvannamalai | Post Office - PO |
| 133 | Arappakkam | Arpakkam BO | 📍 606752 | Tiruvannamalai | Branch Post Office |
| 134 | Arasampattu | Arasampattu BO | 📍 606807 | Vandavasi | Branch Post Office |
| 135 | Arasampet | Radhapuram BO | 📍 606707 | Chengam | Branch Post Office |
| 136 | Arasanganni | Arasankanni BO | 📍 606703 | Chengam | Branch Post Office |
| 137 | Arasanipalai | Arasanipalai BO | 📍 631702 | Cheyyar | Branch Post Office |
| 138 | Arasankuppam | Tiruppanangadu BO | 📍 604410 | Cheyyar | Branch Post Office |
| 139 | Arasanthangal | Melpadur BO | 📍 606702 | Chengam | Branch Post Office |
| 140 | Arasanur | Oorgoundanur BO | 📍 606710 | Chengam | Branch Post Office |
| 141 | Arasavalli | Veerappanur B.O | 📍 635703 | Polur | Branch Post Office |
| 142 | Arasudaiyampattu | Meyyur BO | 📍 606753 | Tiruvannamalai | Branch Post Office |
| 143 | Arasur | Erumaivetti BO | 📍 604401 | Cheyyar | Branch Post Office |
| 144 | Arasur | Arasur BO | 📍 604408 | Vandavasi | Branch Post Office |
| 145 | Arathavadi | Arattavadi BO | 📍 606709 | Chengam | Branch Post Office |
| 146 | Aridharimangalam | Kanji SO | 📍 606702 | Chengam | Post Office - PO |
| 147 | ArimaNagar | Kuppam BO | 📍 632311 | Arani | Branch Post Office |
| 148 | Ariyakunju | S Sorpanandal BO | 📍 606706 | Chengam | Branch Post Office |
| 149 | Ariyalur | Palayanur BO | 📍 606811 | Tiruvannamalai | Post Office - PO |
| 150 | Ariyampoondi | Arunthodu BO | 📍 604501 | Vandavasi | Branch Post Office |