---
schema_version: "1"
id: 68c775d539551f63ffbadd3f98e69456c75027552f88b936b5cc5b90cf1ff1d6
title: Create a Population in Contact Builder
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_cab_create_a_population.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_cab_create_a_population.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 5c911272677aad73ce0393f6c38d3ce4fd158854a10f1e1a9d7ef8002d37d056
description: Create a population in Marketing Cloud Engagement Contact Builder.
products:
  - Marketing
  - Marketing Cloud Engagement
release: "264"
---
# Create a Population in Contact Builder

Create a population in Marketing Cloud Engagement Contact Builder.

1. From Contact Builder, open Data Designer.
2. Click the arrow next to Create Attribute Group and select **Create Population**.
3. Follow the prompts to select a data extension in Contact Builder.
    
    Use a data extension with a primary key value and link to the contact record on the Contact ID or Contact Key attribute. A population requires a 1:1 relationship. You can’t link a data extension set as a population to an attribute set.