CM21 is a postcode district in East Hertfordshire, UK. Below is a complete list of CM21 Postcodes (Active). CM21 postcode district comprises of 315 active postcodes and 3 postcode sectors. CM21 district has a population of 10865, and it has 4686 properties in the region.
| Population | 10865 |
| Addresses / Property Count | 4686 |
| Active Postcodes | 315 |
| Nearby Postcode Districts | 27 |
| Active Postcode Sectors | 3 |
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| Postcode | Latitude | Longitude | Households | Population | Easting | Northing |
|---|---|---|---|---|---|---|
| CM21 9QH | 51.81295200 | 0.15014500 | 10 | 11 | 548316 | 214888 |
| CM21 9QJ | 51.81519800 | 0.14973000 | 8 | 15 | 548280 | 215137 |
| CM21 9QL | 51.81285000 | 0.14982100 | 18 | 19 | 548294 | 214876 |
| CM21 9QN | 51.81544300 | 0.14916100 | 13 | 25 | 548240 | 215163 |
| CM21 9QP | 51.81007500 | 0.14567100 | 6 | 13 | 548017 | 214559 |
| CM21 9QU | 51.81527300 | 0.14810800 | 5 | 7 | 548168 | 215142 |
| CM21 9QW | 51.81504500 | 0.15023000 | 6 | 8 | 548315 | 215121 |
| CM21 9RA | 51.81204900 | 0.16054600 | 30 | 42 | 549036 | 214809 |
| CM21 9RB | 51.81353800 | 0.16083700 | 31 | 51 | 549051 | 214975 |
| CM21 9RD | 51.80781000 | 0.15937300 | 29 | 43 | 548969 | 214335 |
| CM21 9RE | 51.80988700 | 0.14560400 | 6 | 8 | 548013 | 214538 |
| CM21 9RF | 51.81317300 | 0.16110900 | 88 | 133 | 549071 | 214935 |
| CM21 9RG | 51.81314600 | 0.16054000 | N/A | N/A | 549032 | 214931 |
| CM21 9TD | 51.81239300 | 0.15168500 | 4 | 6 | 548424 | 214829 |
| CM21 9YZ | 51.81239700 | 0.15933100 | N/A | N/A | 548951 | 214845 |