Micro id

Text

Identifies the 5-digit Micropolitan Statistical Area code for the surrounding postcode, or NULL if the postcode is not in a micropolitan area. Known or imputed for 5,466 postcodes — 16.0% of the postcodes Faraday knows.

You only pay for people we match.

Append to a file

At a glance

Coverage today
16.0%
Typical coverage
16.0%
Postcodes with a value
5.5K
Share in largest category
2.0%
Most values come
from the area
Latest collection
Dec 31, 2024

How the categories split

n = 5,466

Share of postcodes in each category. 99+ categories, of which the 20 largest are shown, with 2.0% in the largest.

30100
2.0%
36837
0.8%
39060
0.8%
45860
0.7%
36300
0.7%
26860
0.6%
14140
0.6%
21700
0.5%
30940
0.5%
45900
0.5%
18180
0.5%
27460
0.5%
18500
0.5%
36460
0.5%
12300
0.5%
14660
0.5%
40700
0.5%
31940
0.5%
38460
0.4%
28300
0.4%
All other values
87.7%
Distinct categories
99+
Share in largest category
2.0%
Share in top 3 categories
3.5%

Every category

99+ categories

The chart above draws the 20 largest. Search here for one it does not. This list holds the 100 most common; rarer values are not named.

  • 301002.0%108 postcodes
  • 368370.8%44 postcodes
  • 390600.8%41 postcodes
  • 458600.7%39 postcodes
  • 363000.7%37 postcodes
  • 268600.6%35 postcodes
  • 141400.6%31 postcodes
  • 217000.5%30 postcodes
  • 309400.5%28 postcodes
  • 459000.5%27 postcodes
  • 181800.5%27 postcodes
  • 274600.5%26 postcodes
  • 185000.5%26 postcodes
  • 364600.5%26 postcodes
  • 123000.5%25 postcodes
  • 146600.5%25 postcodes
  • 407000.5%25 postcodes
  • 319400.5%25 postcodes
  • 384600.4%24 postcodes
  • 283000.4%24 postcodes
  • 395000.4%23 postcodes
  • 461800.4%21 postcodes
  • 259000.4%21 postcodes
  • 172200.3%19 postcodes
  • 131800.3%19 postcodes
  • 402600.3%19 postcodes
  • 414000.3%18 postcodes
  • 407800.3%18 postcodes
  • 329400.3%18 postcodes
  • 327400.3%18 postcodes
  • 103000.3%17 postcodes
  • 182600.3%17 postcodes
  • 371400.3%17 postcodes
  • 449800.3%17 postcodes
  • 497800.3%16 postcodes
  • 367000.3%16 postcodes
  • 117800.3%15 postcodes
  • 354200.3%15 postcodes
  • 339800.3%15 postcodes
  • 192600.3%15 postcodes

Category shares over time

459003.3% (largest)

The 5 largest categories, each followed across 4 collections. Estimated from a 1% sample of postcodes.

Dec 2021Dec 2022Dec 2023Dec 2024
4586030100459002609018180

Coverage

Latest collection: 41,117 postcodes

Coverage by state

Percentage of postcodes in each state with a value.

Coverage over time

16.0% today

Share of postcodes holding a value at each monthly snapshot. A value carries forward for one year.

Dec 21Dec 22Dec 23Dec 24Jan 25Dec 25May 26

How we arrive at a value

Whether a value was observed on the person themselves, carried from their address, or estimated from the people around them.

On the person — 0%
Not used for this attribute — no value is inherited this way.
From address — 0%
Not used for this attribute — no value is inherited this way.
From geography — 100%
Estimated from other people in their postcode or region.

Coverage, in context

Where 16.0% sits on the catalog’s own coverage range.

catalog min 11%max 100%

Higher coverage than 1% of postcode-level attributes in the catalog

Freshness

How recently this was collected, and how often a new collection arrives. Each bar is the number of postcodes in that collection. Gaps are real — collection is periodic, not continuous.

Dec 31, 2024
latest collection
21 months 17 days
since the latest collection
yearly
new collection cadence
Dec 21Dec 22Dec 23Dec 24

Change between collections

The share of postcodes whose category changed.

0.0%

of postcodes changed value between the two most recent collections. Nothing changed. The catalog median is 16.0%.

Contribution ledger

4 ingestions

1 authority contributed since Dec 2021.

ObservedIngestedCountID
41,117e2d21660-1ea6-430a-8bf9-33673e10fdd6
41,045263a35d2-5801-4741-b944-e98bac372850
41,0452a630c8a-310d-4609-85f0-6b111e297fd3
41,045bd04e3fc-186d-491b-8619-c4aa7f2f47a9

Related attributes

Attributes whose descriptions are closest to this one.

Neighbors found Oct 2026.

Use it in the API

Send an email, phone, or address. Get Micro id back in real time.

  1. Add micro_id to a project.
  2. Send an email, phone, or address to the project's append endpoint. The response carries Micro id for the matched person.
curl -X POST 'https://api.pro.faraday.ai/v1/projects/YOUR_PROJECT_ID/append' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
      "email": "jane.doe@example.com"
    }'
→ {"attributes":{"micro_id":"30100"}}
Get it by APIAppend to a fileRead the API docs →

Technical details

API name
micro_id
Category
fig/geography
Type · unit
Text
Statistical type
nominal
Allowed values
null
Derivations
null
How values combine
Read from a single source field.
Directionality
null
Deprecation
false