neighbourhood in Leiden
De Kooi
6,185 residents · postal code 2315 · Part of Leiden-Noord, Leiden
Everything close by, little space
Three of the five pillars come out at practically the same figure in De Kooi: safety, wealth & income and quiet & nature all three lie around 3.5. Such an evenly low picture is unusual — most neighbourhoods have an outlier upwards somewhere. Amenities and families do that here too, but those two both measure mainly distance, and in a densely populated Leiden neighbourhood distances are short by definition.
Behind the wealth figure sits above all social assistance, at a multiple of the national level, and a property value that stays well below it; vacancy actually lies exactly on the median. The safety pillar points in all directions at once: violence, burglary, vandalism and theft each occur there more often than in the average Dutch neighbourhood, violence at a good one and a half times. None of the four stands out — they carry the figure together.
- no. 11,442 of 13,075 neighbourhoods with a grade
- no. 44 of 53 in Leiden
How De Kooi scores
Do some of these matter more to you than others?
Is De Kooi a safe neighbourhood?
For 2025, De Kooi comes out at 33 recorded crimes per 1,000 people present; the national middle is 24. That is more than in most Dutch neighbourhoods.
The figures ⌄Safety
Registered crimes per 1,000 people present per year: residents plus business activity. Figures for small neighbourhoods are smoothed.
In 2025, 278 crimes were recorded here. The figures above are per 1,000 people present (residents + businesses).
Tick = Dutch median
The safest neighbourhoods in Leiden →The most dangerous neighbourhoods in Leiden →
The figures ⌄Amenities
Average distance to everyday amenities, compared with the Dutch median.
Tick = Dutch median
The figures ⌄Wealth & income
What the homes are worth, what residents earn and how many homes stand empty. It describes the area, not the people living in it.
Not counted
Part of this score's subject, but not part of the grade.
Tick = Dutch median
The figures ⌄Quiet & nature
How tightly the addresses sit together, how much noise there is, and how much green, trees and water surround it.
Not counted
Part of this score's subject, but not part of the grade.
Not part of the grade: air quality varies mostly between regions, barely between neighbourhoods within one municipality. WHO guideline: 5 µg/m³. Calculated annual mean, RIVM 2024.
Tick = Dutch median
The figures ⌄Families
How practical this area is with children: distance to school and childcare, and how many children already live here.
Tick = Dutch median
Who lives here
De Kooi has strikingly many residents aged 25 to 45: 37%, against 22% in the average Dutch neighbourhood.
Age profile
- 0–1514%
NL median 14%
- 15–2513%
NL median 11%
- 25–4537%
NL median 22%
- 45–6522%
NL median 28%
- 65+15%
NL median 22%
Share of residents per age group (CBS, 2025). All five bars share one scale, so their lengths can be compared with each other.
Average household size
1.9 — smaller than average
NL median 2.3
Single-person households
50% — far more than average
NL median 31%
Households with children
25% — fewer than average
NL median 35%
Residents per km²
9,453 — far more densely populated than average
NL median 2,364
Tick = Dutch median. Households with children counts towards Families, population density towards Quiet & nature; the other figures here get no grade.
Frequently asked questions
Is De Kooi a safe neighbourhood?
For 2025, De Kooi comes out at 33 recorded crimes per 1,000 people present; the national middle is 24. That is more than in most Dutch neighbourhoods. One caveat: the figure counts per person present, not per resident. In a neighbourhood with many visitors — a centre, a station, a shopping area — it therefore comes out higher than residents experience. The figure is about what the police record, not about the people who live there.
How much crime is there in De Kooi?
In De Kooi the police recorded 278 crimes in 2025: theft, burglary, violence and vandalism combined. The comparison figure above (33 per 1,000) is not simply that count divided by the number of residents: we count residents plus workplaces, so a shopping street or station is not unfairly penalised, and for small counts we pull the figure towards the national average — otherwise a single incident would make a small neighbourhood look unsafe.
How is the grade for De Kooi calculated?
De Kooi scores 3.4 as its total score. That grade is a national position: we weigh five equally heavy scores — safety, amenities, wealth & income, quiet & nature and families — and see where De Kooi lands among every neighbourhood in the Netherlands. So it is not the mean of the five grades, but a place in the queue. All from open data published by CBS and the police.
The best and worst neighbourhoods of Leiden
Same total grade, same yardstick — from the top to the bottom of Leiden.
Highest grades
Lowest grades
More about this area
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