CM20 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 551 postcodes across 3 sectors in Harlow.
Full fibre
0%
Gigabit
68%
Superfast
89%
Postcodes
551
CM20 covers 551 postcodes in East Hertfordshire. Gigabit reaches 67.6%, with zero below-USO coverage.
Broadband speeds in CM20
Share of CM20 premises by the fastest download speed available, averaged across all 551 postcodes in the district.
Superfast spans 89.1% of premises. Gigabit services are available to 67.6%, with speed tier data showing 70.9% achieve 300 Mbps or above and 18.2% sit on 30-300 Mbps. A 3.3-point gap between ultrafast at 70.9% and gigabit at 67.6% points to scattered fibre-to-the-cabinet infrastructure without gigabit speeds. Below-USO coverage is zero. Only 2.2% fall below 10 Mbps, a small tail reflecting some legacy infrastructure but overall strong coverage. Cable gigabit is concentrated in parts of the postcode, particularly in higher-density areas. Most premises have solid broadband options available.
Source: Ofcom Connected Nations. Percentages are district-wide averages of postcode-level availability, so rows may not sum to exactly 100%.
Connectivity in detail
Below 10 Mbps USO
0%
Premises unable to get the 10 Mbps universal service minimum
Fixed wireless
0%
Premises that can use a fixed wireless access service
Broadband by sector
CM20 splits into 3 postcode sectors. Coverage and prices can differ street by street, so open a sector below to find your exact postcode.
| Sector | Postcodes | Superfast | Full fibre | Gigabit |
|---|---|---|---|---|
| CM20 1 | 163 | 84% | 0% | 62% |
| CM20 2 | 198 | 84% | 0% | 52% |
| CM20 3 | 190 | 99% | 0% | 89% |
All CM20 1 postcodes (163)
All CM20 2 postcodes (198)
All CM20 3 postcodes (190)
Best deals
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Living in Harlow
CM20 balances urban Hertfordshire strength with rural fringes. Cable gigabit is concentrated, not universal. Premises outside cable zones typically have adequate superfast speeds.
Remote worker score
53/100
Connectivity and amenities for home working
Family score
50/100
Schools, safety and family amenities
Value score
50/100
What you get for the local price level
CM20 broadband FAQs
Is gigabit available to most premises?
Gigabit reaches 67.6% of postcodes, placing the area in the mid-to-strong range.
What's the connectivity baseline for unserved postcodes?
Approximately 18% have superfast speeds on fibre-to-the-cabinet or copper infrastructure.
Why do some postcodes have only ultrafast, not gigabit?
Fibre-to-the-cabinet deployments can deliver 30-300 Mbps ultrafast speeds without reaching gigabit capability.
Should I check coverage for my specific postcode?
Yes; given the 67.6% gigabit availability, postcode-specific research is essential to understand local provision.
Neighbouring districts
Check your exact postcode
Every postcode in CM20 has its own page with broadband speeds, house prices, school ratings and crime stats. You can also compare providers for your address.
Data sources: Broadband data from Ofcom Connected Nations 2025 · House prices from HM Land Registry · Crime from Police.uk · See all data sources