What does an MK20 postcode tell you?

That the address lies in the MK20 district of the MK (Milton Keynes) postcode area, and the place OS Open Names most often lists first for its postcodes is Caldecote. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 6 live postcodes.

MK20 postcode district

MK20, in the MK (Milton Keynes) postcode area, has 6 live postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 10 roads under it.

postcode area	MK (Milton Keynes)
live postcodes	6
sectors	1
roads listed	10
companies registered	1
centroid	52.07381, -0.71975
directory release	2026-08

Postcodes and sectors

6 of the district's 6 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 52.07381, -0.71975, which locates the district, not a building.

sector	live	terminated
MK20 0	6	0

Companies registered in MK20

Companies House lists 1 company with a registered office in MK20 (1 October 2026 snapshot).

Places OS Open Names lists for MK20

Caldecote
Milton Keynes
South East

Roads filed under MK20

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

Colne Way
Dee Drive
Eden Grove
Exe Close
Mersey Gardens
Taw Gardens
Tees Drive
Willen Road
Yare Street
A422

Check an address in MK20

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=MK20" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about MK20

What does an MK20 postcode tell you?: That the address lies in the MK20 district of the MK (Milton Keynes) postcode area, and the place OS Open Names most often lists first for its postcodes is Caldecote. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 6 live postcodes.

Where the counts come from

ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest MK20

MK161.8 km
MK152.0 km
MK142.7 km
MK103.9 km
MK94.4 km
MK134.8 km
MK65.2 km
MK76.4 km
MK126.9 km
MK57.4 km
MK87.5 km
MK17.6 km
Every district
How a British address is written
Check any address

distance between the districts' centroids

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