Anambra State postal codes begin with 42 or 43. The state’s codes run from 420102 up to 435115 in the published ranges, and the Awka head office code follows the usual pattern at 420001.
Anambra sits in postal region 4 with Enugu, Abia, Imo and Ebonyi. What makes it distinctive is that its capital is not its centre of gravity. Awka governs, but Onitsha and Nnewi generate the post.
Anambra State Postal Code at a Glance
| State capital | Awka |
|---|---|
| Head office code | 420001 (follows the 0001 rule, confirm locally) |
| Code range | 420102 to 435115 |
| Dispatch prefixes | 420, 421, 422, 423, 430, 431, 432, 433, 434, 435 |
| Local Government Areas | 21 |
| Postal region | Region 4 |
| Digits | Six, numeric only |
Reading a Anambra State Code
Take 420001, the Awka head office code. The first digit, 4, puts the address in postal region 4. The first three digits, 420, name the dispatch district that sorts outgoing mail. The last three, 001, are the delivery location, and 001 always means the head office itself.
The same three part structure explains why codes inside one town look almost identical while codes from opposite ends of the state look unrelated. Two houses on the same street usually share all six digits, because they share a delivery round. Two houses in different towns rarely share more than the first three.
Every genuine Anambra State code is built the same way, which gives you a quick test. If someone hands you a code for an address in Anambra State and it does not begin with 42, it is not a Anambra State code.
Dispatch Districts in Anambra State
The state’s blocks split between its three working centres. The 420 block covers Awka and the local governments around the capital. The higher blocks in the 430s reach Onitsha, Nnewi and the southern local governments. That distribution follows commerce rather than administration, which is unusual and reflects how much mail the trading centres pull.
| Dispatch prefix | Codes it issues |
|---|---|
| 420 | 420001 to 420999 |
| 421 | 421001 to 421999 |
| 422 | 422001 to 422999 |
| 423 | 423001 to 423999 |
| 430 | 430001 to 430999 |
| 431 | 431001 to 431999 |
| 432 | 432001 to 432999 |
| 433 | 433001 to 433999 |
| 434 | 434001 to 434999 |
| 435 | 435001 to 435999 |
The 21 Local Government Areas in Anambra State
Anambra has 21 local government areas. Onitsha North and Onitsha South between them hold the market district, while Nnewi North and Nnewi South carry the manufacturing belt.
| Aguata | Anambra East | Anambra West |
| Anaocha | Awka North | Awka South |
| Ayamelum | Dunukofia | Ekwusigo |
| Idemili North | Idemili South | Ihiala |
| Njikoka | Nnewi North | Nnewi South |
| Ogbaru | Onitsha North | Onitsha South |
| Orumba North | Orumba South | Oyi |
What you will not find above is a code beside each name, and that is deliberate. NIPOST issues codes to delivery districts, not to local governments. Tables that pair the two are estimates, which is why published lists for Anambra State contradict each other and sometimes contradict themselves.
Onitsha Main Market and Commercial Post
Onitsha holds one of the largest markets in West Africa, and the volume of business correspondence it generates is out of proportion to the town’s population. Traders there have used the same shop and line addressing for decades, and mail is commonly addressed to a shop number within a named line inside the market rather than to a street.
That works because the market’s internal geography is well known to everyone delivering there. It does not work on a bank form, which wants a street and a code, and the mismatch is a routine source of failed address verification for Onitsha traders.
Nnewi and the Industrial Cluster
Nnewi built Nigeria’s motor parts industry and now hosts a manufacturing cluster with genuinely corporate addressing. Companies there publish full street addresses and use them consistently, so post to Nnewi industrial addresses behaves more predictably than post to the markets.
Awka, and the Onitsha Asaba Border
Awka has grown quickly since becoming the capital in 1991, and government offices there use the standard secretariat and private mail bag arrangement. Its telephone area code is 02048, separate from Onitsha’s 02046, a useful reminder that the two are distinct postal towns as well.
The most common Anambra addressing error involves the Niger bridge. Onitsha is Anambra at 420 and above, Asaba is Delta at 320. The two towns face each other and function as one urban area, but a code from the wrong side of the river will fail any check that compares code against state.
If Your Address Is New or Unlisted
Newly built areas sit in a gap: the houses are there, the delivery district has not caught up. A delivery district is drawn when an area has enough post to justify a round, so a new estate is usually absorbed into the nearest existing district rather than given its own. That means your code is real, but it belongs to the district next door rather than to your street.
Three things help. Use the code your delivery office gives you even if it seems to belong somewhere else, because that is the round your post is on. Put the estate name and the nearest main road in the address, since those carry the item the last kilometre. And keep a phone number on anything that matters, because in Anambra State as everywhere else in Nigeria, the last stage of delivery is a call rather than a code.
Post Office Boxes and Private Mail Bags in Anambra State
A rented box belongs to one branch, so the branch name carries the address. Leave it out and the box number means nothing. A private mail bag works the same way but is issued to an organisation rather than an individual, which is why ministries, universities and large companies publish one instead of a street address.
The layout looks like this:
P.O. Box 1234 Awka Main Post Office 420001 Awka Nigeria
Two practical notes. A box address is often more reliable than a street address in Anambra State, because it removes the guesswork about which delivery district covers you, and it survives you moving house. But couriers who deliver to the door, which is most of them, cannot deliver to a box at all, so keep a street address for anything that arrives by bike.
Codes Published for Anambra State That Cannot Be Right
We compared the Anambra State code tables that circulate online against themselves. A code belongs to one delivery district, so if two local governments are published with ranges that share numbers, at least one of the two is invented. Anambra State fails that test in 2 visible places, and here are the clearest.
Ranges that swallow their neighbours:
- Ekwusigo at 435112 to 435115 overlaps Nnewi South at 435102 to 435113.
- Onitsha North at 430001 to 430282 overlaps Onitsha South at 430212 to 430283.
None of this means the numbers themselves are fictional. They sit in the correct blocks for Anambra State. What is fictional is the neat range attached to a local government, because that mapping was estimated by whoever first built the table, and every site that copied it inherited the estimate.
It is worth knowing how wrong codes get into circulation in the first place, because the same three routes explain almost every bad table online. The first is interpolation, where somebody knows two real codes and fills the gap between them with a tidy range. The second is inheritance, where one site guesses and forty others copy it, which is why a wrong code can look authoritative through sheer repetition. The third is drift, where a code was right when it was published and the delivery district was later split or merged.
You can check any Anambra State code you are given in two steps. Confirm it starts with one of the dispatch prefixes listed above, which rules out codes belonging to another state entirely. Then confirm the last three digits with the delivery office, which is the only part no table can settle for you.
What Happens to a Letter Posted in Anambra State
Knowing the chain explains why the first three digits matter more than the last three. A letter posted anywhere in Anambra State is collected to the nearest branch, then moved to the dispatch office named by the first three digits of the destination code. Outgoing post leaves the state through the region 4 network, and incoming post arrives the same way in reverse, landing at the dispatch office before it is broken down to the delivery round in the last three digits.
The code earns its keep on registered and tracked items. Ordinary post in Anambra State is forgiving, because a postman who recognises the street will deliver it regardless of the digits. A registered item, an EMS parcel or anything arriving from abroad is handled against the code at each transfer, so a wrong dispatch prefix on those can add days or send the item back.
Get the first three digits wrong and your letter travels to the wrong part of the country before anyone notices. Get the last three wrong and it usually still arrives, a day late, because the delivery office recognises the street. This is why a head office code such as 420001 is a safe fallback and a random six digits is not.
How to Write a Anambra State Address
Anambra addresses lean on the market or industrial cluster as much as on the street, particularly in Onitsha and Nnewi.
The order NIPOST expects runs from the specific to the general, with the code on the same line as the town:
Chief E. Obiora 32 New Market Road Onitsha 430001 Anambra State Nigeria
Two habits worth breaking. Do not put the code on its own line at the bottom the way American addresses do, because Nigerian sorting reads it beside the town name. And do not drop the state, even for a well known city, because several towns share names across states and the state is what disambiguates them.
Neighbouring Codes in Region 4
Anambra State shares its postal region with the states below. If a code you have been given starts with one of their prefixes, the address is not in Anambra State.
| State | Prefix |
|---|---|
| Enugu | 400 |
| Abia | 440 |
| Imo | 460 |
| Ebonyi | 480 |
Finding the Code for Your Street
- Your delivery office holds the list that matters. Give them the street and the nearest landmark, and they will tell you which district code covers it.
- Search the NIPOST postcode finder by address rather than by local government.
- Where the delivery is informal anyway, use 420001, the Awka head office code, which routes correctly across the state.
What to Enter on a Form
Type 420001 if you are in or near Awka and do not know your district code. Six digits, no spaces. Avoid 23401 and 00000, which are not NIPOST codes and mean nothing to a sorting office even though most websites accept them.
If a foreign site rejects the code because it wants five digits, that is a validation fault on their end rather than a problem with your address. Enter the six digits wherever the form allows it, and never invent a shorter code for anything a bank, an embassy or a courier will check.
The New Code Coming in October
A new national postcode arrives on 1 October 2026. It runs 11 characters and goes all the way down to the building. Anambra’s market addressing is exactly the case building level codes are designed for, since a shop inside a market line can finally carry a code that a bank form will accept.
Quick Facts
- Anambra State head office code: 420001
- Range: 420102 to 435115
- Dispatch prefixes: 420, 421, 422, 423, 430, 431, 432, 433, 434, 435
- Local Government Areas: 21
- Capital: Awka
- New alphanumeric postcode: 1 October 2026
Frequently Asked Questions
What is the zip code for Anambra State?
State codes fall in the 420 to 435 range. The Awka head office code follows the standard pattern at 420001, which is the safe entry when a form asks for a code.
What is the postal code for Onitsha?
Onitsha is served from the higher Anambra blocks in the 430s. Confirm the exact district code locally, since the town has several delivery rounds including the market area.
What is the postal code for Nnewi?
Nnewi sits in the same upper block group as Onitsha. Its industrial addresses are among the most consistently used in the state.
Is Onitsha in the same postal area as Asaba?
No. Onitsha is Anambra and its codes begin 42 or 43. Asaba is Delta and its codes begin 32. They face each other across the Niger but sit in different postal regions.
Can I use a market shop number as my postal address?
For local delivery, yes, because everyone delivering in Onitsha knows the market lines. For bank verification or an international shipment, no, because those systems need a street and a code.
How many local governments does Anambra have?
Twenty one, including the two Onitsha and two Nnewi local governments that carry most of the state’s commercial post.
Is the Awka area code the same as the postal code?
No. Awka’s telephone area code is 02048 and Onitsha’s is 02046. Postal codes for the state begin 42 or 43.
Why is the Anambra head office code not confirmed?
Because the published tables for the state start at 420102 rather than at 420001. The 0001 ending is the standard head office pattern nationally, so 420001 is the expected code, but confirm it at the Awka branch before relying on it.
Summary
Anambra codes begin with 42 or 43 and run through to 435115. The state sits in postal region 4 and splits its post between Awka, which governs, and Onitsha and Nnewi, which trade and manufacture. Twenty one local governments, with the commercial weight concentrated in four of them.
Conclusion
Name the town first in any Anambra address. Use the Awka head office code on forms, keep a street address alongside your market or box address for anything a bank will check, and never carry an Asaba code across the bridge.