CM20 3 is a postcode sector within the CM20 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM20 3 postal sector is the Harlow Delivery Office.
The area of the CM20 3 postcode sector is 0.98 square miles which is 2.54 square kilometres or 628.62 square acres.
In the year 2017 there were 171 house sales in the CM20 3 with the average house price being £268,830.
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| C | M | 2 | 0 | Space | 3 | Letter | Letter |
| The CM20 3 Sector is within these Local Authorities |
| The CM20 3 Sector is within these Counties |
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The CM20 3 Sector is within these Water Company Areas |
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| Town | Type |
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| Harlow | Town |
