Postcode (market research)

Back to glossary

Postcode (market research)

In market research, a postcode is commonly used to help ensure that samples are geographically representative and quotas are met.

For example, a local council or organisation may want to speak to respondents evenly spread across different boroughs, districts, or regions within a city or county. Collecting postcodes allows researchers to monitor and control the geographic distribution of respondents, helping to avoid over-representation from any single area.

Typically, only the first part of the postcode is required, as this provides a broad understanding of the respondent’s location without compromising privacy. Collecting the full postcode can raise data protection considerations, since it can potentially identify individual households.

Postcode data is therefore a practical tool in sampling and analysis, helping researchers manage quotas, segment audiences geographically, and generate insights based on location while maintaining compliance with data protection regulations.

Why partner with DJS Research?

Senior-led sector experts icon

We build small, director-led, teams of sector experts who are with you from brief to debrief. As an employee-owned company, every one of us is invested in delivering quality, value, and long-term impact.

Research design icon

From agile testing to deep-dive strategic studies, we design research to meet your specific objectives. The agility of our in-house operations team and strength of our UK-wide recruiter network enable seamless execution at scale.

Customer understanding icon

Our sector-focused teams have decades of experience understanding audiences and the complexities of the markets in which our clients operate. Working collaboratively we deliver actionable insight which drives positive change.

We are small enough. We are big enough. We are DJS Research

We'd love to talk...

Contact us today to discuss your next market research project and discover how we could become a valuable extension of your team.

Contact us

Contact us today to discuss your next market research project and discover how we could become a valuable extension of your team.

Contact us