The AL postcode area, also known as the St Albans postcode area, is a group of ten postcode districts in central Hertfordshire which are subdivisions of five post town

Post town

A post town is a required part of all postal addresses in the United Kingdom, and a basic unit of the postal delivery system. Including the correct post town in the address increases the chances of a letter or parcel being delivered on time. Post towns are usually based upon the location of...

s.

Mail posted in this area is processed in Watford (Ascot Road WD18), and is delivered from offices at St Albans (Brick Knoll Park AL1), Harpenden (Station Road AL5), and Hatfield (Town Centre AL10). The area served includes St Albans

City and District of St Albans

The City of St Albans , also known as the City and District of St Albans or District of St Albans, is a local government district, in Hertfordshire, England. It was created in 1974 and since then has held the status of non-metropolitan district and city. The local authority is St Albans City Council...

 and Welwyn Hatfield

Welwyn Hatfield

The Borough of Welwyn Hatfield is a local government district in southern Hertfordshire, England.Its covers the two towns of Welwyn Garden City and Hatfield, along with numerous smaller settlements from Woolmer Green in the north to Little Heath in the south. Each of the towns has a railway station...

.

Coverage

The approximate coverage of the postcode districts:

|-
! AL1
| ST. ALBANS
| St Albans

St Albans

St Albans is a city in southern Hertfordshire, England, around north of central London, which forms the main urban area of the City and District of St Albans. It is a historic market town, and is now a sought-after dormitory town within the London commuter belt...

| St Albans
|-
! AL2
| ST. ALBANS
| St Albans, Bricket Wood

Bricket Wood

Bricket Wood is a village in the county of Hertfordshire, England, approximately 4½ miles from St Albans. It is part of the parish of St Stephen. Its railway station is served by a London Midland service that runs between St Albans Abbey and Watford Junction stations.Close to the village stands...

, Colney Street

Colney Street

Colney Street is a village in the English county of Hertfordshire.It lies on the A5183 road, this was formerly the A5 road and, before that, Roman Britain's Watling Street. In addition its northern boundary is delineated by the M25 motorway. These location advantages have led to it becoming a...

, Frogmore, London Colney

London Colney

London Colney is a village and civil parish in Hertfordshire, England. It is located to the north of London, at Junction 22 of the M25 motorway....

, Napsbury

Napsbury

Napsbury is a residential area to the West of London Colney in the district of St. Albans in Hertfordshire. It was formerly the site of a major psychiatric hospital.-Early history:...

, Park Street

Park Street, Hertfordshire

Park Street is a village on the outskirts of St Albans, Hertfordshire.-Location:Park Street is situated approximately 2½ miles south of St Albans along the Watling Street, the old Roman road from London to Chester and Holyhead. It lies south of the A405 North Orbital Road and on Watling Street...

, Potters Crouch

Potters Crouch

Potters Crouch is a small hamlet in Hertfordshire, England, lying to the south-west of St Albans near Chiswell Green....

, Chiswell Green

Chiswell Green

Chiswell Green is an area, originally a village, in St Albans, Hertfordshire with a population of approximately 2,800, in the City and District of St Albans.It is situated 2 miles south of St Albans on the North Orbital Road, close to Junction 21A of the M25....

| St Albans
|-
! AL3
| ST. ALBANS
| St Albans, Childwickbury

Childwickbury

Childwickbury is a small hamlet in Hertfordshire, England lying to the north of St Albans.Childwickbury Manor was home to Stanley Kubrick from the 1978 until his death in 1999.-External links:* *...

, Flamstead

Flamstead

Flamstead is a village and civil parish in north-west Hertfordshire, England, close to the junction of the A5 and the M1 motorway at junction 9. The name is thought by some historians to be a corruption of the original Verulamstead...

, Gorhambury, Markyate

Markyate

Markyate is a village and civil parish in north-west Hertfordshire close to the border with Bedfordshire and Buckinghamshire.-Geography:Having a number of former names, including Markyate Street and Mergyate, it has been a part of all three counties since it was first founded as the county...

, Porters Wood, Redbourn

Redbourn

Redbourn is a village and civil parish in Hertfordshire, United Kingdom, lying on Watling Street, 3 miles from Harpenden, 4 miles from St Albans and 5 miles from Hemel Hempstead. It has a population of around 6,000.-History:...

, Sandridge

Sandridge

Sandridge is a small village and civil parish between St Albans and Wheathampstead in Hertfordshire, England, United Kingdom.-Early history:...

| St Albans
|-
! AL4
| ST. ALBANS
| St Albans, Colney Heath

Colney Heath

Colney Heath is a large village south-east of St Albans, Hertfordshire, United Kingdom.The population of the ward of Colney Heath at the time of the 2001 census was 5,449....

, London Colney, Jersey Farm

Jersey Farm

Jersey Farm is a district of St Albans situated approximately 2 miles north-east of the city centre. It is largely surrounded by countryside and is 'attached' to St Albans by the district of Marshalswick to its south-west....

, Marshalswick

Marshalswick

Marshalswick is a district of St Albans, in Hertfordshire, England around 1.5 miles North East of the city centre. Marshalswick borders on Jersey Farm, Fleetville and Bernards Heath and historically fell within the bounds of Sandridge Parish to the North....

, Oaklands

Oaklands College

Oaklands College is a Further education college in Hertfordshire, England in the United Kingdom.- Profile :Oaklands College is a large general Further Education College. It has campus sites in St Albans City, St Albans Smallford, Alban Park, Welwyn Garden City and a further training provision in...

, Sandridge, Smallford, Tyttenhanger, Wheathampstead

Wheathampstead

Wheathampstead is a village and civil parish in the City and District of St Albans, in Hertfordshire, England. It is north of St Albans and in the Hitchin and Harpenden parliamentary constituency....

| St Albans
|-
! AL5
| HARPENDEN
| Harpenden

Harpenden

Harpenden is a town in Hertfordshire, England.The town's total population is just under 30,000.-Geography and administration:There are two civil parishes: Harpenden and Harpenden Rural....

| St Albans
|-
! AL6
| WELWYN
| Welwyn

Welwyn

Welwyn is a village and civil parish in Hertfordshire, England. The parish also includes the villages of Digswell and Oaklands. It is sometimes called Old Welwyn to distinguish it from the newer settlement of Welwyn Garden City, about a mile to the south.-History:Situated in the valley of the...

, Ayot St Peter

Ayot St Peter

Ayot St Peter is a village and civil parish in the Welwyn Hatfield district of Hertfordshire, England, about two miles north-west of Welwyn Garden City. According to the 2001 census it had a population of 166. The village is near Ayot St Lawrence....

, Ayot St Lawrence

Ayot St Lawrence

Ayot St Lawrence is a small village and civil parish in Hertfordshire, between Harpenden and Welwyn. There are several other Ayots in the area, including Ayot Green and Ayot St Peter....

, Digswell

Digswell

Digswell is an ancient village in the English county of Hertfordshire which is recorded in the 1086 Domesday Book.Digswell's name may be derived from Deacon's Well. There were two Manors, with 2 water Mills, much land under plough, and a large area of woodland...

, Rabley Heath, Tewin

Tewin

Tewin is a village in the English county of Hertfordshire, between the towns of Welwyn Garden City, Stevenage, Welwyn and the county town Hertford, it is within commuting distance of London...

| Welwyn Hatfield
|-
! AL7
| WELWYN GARDEN CITY
| Welwyn Garden City

Welwyn Garden City

-Economy:Ever since its inception as garden city, Welwyn Garden City has attracted a strong commercial base with several designated employment areas. Among the companies trading in the town are:*Air Link Systems*Baxter*British Lead Mills*Carl Zeiss...

| Welwyn Hatfield
|-
! AL8
| WELWYN GARDEN CITY
| Welwyn Garden City, Lemsford

Lemsford

Lemsford is a village and parish in Hertfordshire. It is near Welwyn Garden City and was created out of Hatfield parish in 1858.It is nearly 3 miles N. from Hatfield, on the S.E. side of Brocket Hall Park. It is widely known for its large mill on the River Lea, which is now the headquarters of...

| Welwyn Hatfield
|-
! AL9
| HATFIELD
| Hatfield

Hatfield, Hertfordshire

Hatfield is a town and civil parish in Hertfordshire, England in the borough of Welwyn Hatfield. It has a population of 29,616, and is of Saxon origin. Hatfield House, the home of the Marquess of Salisbury, is the nucleus of the old town...

, Brookmans Park

Brookmans Park

Brookmans Park is a village, located in the civil parish of North Mymms, in Hertfordshire, southeast England. It is well known for its varied and interesting local history, including an ancient historic estate that used to exist within its boundaries, its BBC transmitter station, and excellent...

, Essendon

Essendon, Hertfordshire

Essendon is a Hertfordshire village and civil parish located 6 miles south-west of the town of Hertford on the B158 road.The village is 100 metres above sea level and offers views of the Lea Valley to the north. Although on an ancient site, St Mary's Church dates mainly from the 17th and 18th...

, North Mymms

North Mymms

North Mymms is a civil parish in the English county of Hertfordshire.The village itself has suffered from enclosure. North Mimms Park and Brookmans Park enclose large areas of the parish. Even the parish church stands in the park of North Mimms; in it is a chapel, the burialplace of the Coningsbys...

| Welwyn Hatfield
|-
! AL10
| HATFIELD
| Hatfield
| Welwyn Hatfield

|}