List of Districts in Bihar; India PIN Codes

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Districts in Bihar

District	Count of Postal Codes
Araria	171
Arwal	82
Aurangabad	277
Banka	221
Begusarai	239
Bhagalpur	254
Bhojpur	303
Buxar	186
Darbhanga	368
Gaya	379
Gopalganj	208
Jamui	165
Jehanabad	126
Kaimur (Bhabua)	133
Katihar	185
Khagaria	154
Kishanganj	91
Lakhisarai	91
Madhepura	202
Madhubani	427
Munger	115
Muzaffarpur	419
Nalanda	327
Nawada	189
Pashchim Champaran	274
Patna	438
Purbi Champaran	424
Purnia	178
Rohtas	270
Saharsa	166
Samastipur	378
Saran	389
Sheikhpura	100
Sheohar	46
Sitamarhi	301
Siwan	329
Supaul	211
Vaishali	297

A Postal Index Number (PIN or PIN Code) refers to a six-digit code in the Indian postal code system used by India Post.

The PIN system was introduced on 15 August 1972. The first digit of a PIN indicates the zone, the second indicates the sub-zone, and the third, combined with the first two, indicates the sorting district within that zone. The final three digits are assigned to individual post offices within the sorting district.