C60/100
CM21 is a postcode district associated with East Hertfordshire. These profiles combine postcode-district records with wider-area context. The legacy composite score is experimental; source dates and limitations are listed below.
Safety
C89% below avg
Schools
A100% Good or Outstanding
Transport
F1 rail stations nearby
Afford.
FMedian £426,000
Environ.
BData under review
Health
A+3 GP practices nearby
Education
CAround average
Community
AStrong community
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This page covers the CM21 postcode district, which includes all postcodes starting with CM21 (e.g. CM21 3RG, CM21 4AB, CM21 5XX). All postcodes within CM21 share the same district-level data.
Data last updated October 2026 · Official UK government sources