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This archive contains 2,538 published national party-support polls for Poland, covering 1989 to 2026. Compare individual polls, pollsters and long-term trends, then check the linked source table.
Reviewed country guide
How Polish Sejm polling relates to district proportional representation, party and coalition thresholds, changing alliances and the local balance.
Advanced research view
Each poll is compared with a weighted average of other pollsters within 14 days. A pollster appears only after five evaluated polls in the selected range.
These are descriptive signed differences, not evidence of bias, accuracy, or future performance, and they are not a prediction.
| Party | Pollster | Polls evaluated | Median difference | Interquartile range |
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Sourced context
Party, coalition, methodology and declared archive changes that affect how this series should be read.
Method & maintenance
The headline average uses polls ending within 45 days of the latest fieldwork date. Polls are weighted by recency (a 30-day half-life) and the square root of sample size, which reduces the influence of unusually large polls. Missing sample sizes use a default of 1,000. The chart can also switch to a wider smoothing window when you want a calmer line.
Trendlines are descriptive, not forecasts. Missing values are left out rather than treated as zero. Polling error, house effects, turnout and electorate wins all mean that this is a snapshot—not a prediction of election day.
This page loads a versioned Bismuth snapshot from the site. Source collection and validation run separately, so visitor pages never scrape polling sources. If a source update fails, the last verified snapshot remains available and is clearly marked as stale.