LEAST BIASED
These sources have minimal bias and use very few loaded words (wording that attempts to influence an audience by appeals to emotion or stereotypes). The reporting is factual and usually sourced. These are the most credible media sources. See all Least Biased Sources.
- Overall, we rate Mason-Dixon Polling as Least Biased based on polling that minimally favors the right. We also rate them as High Factual pollsters based on an A- rating in predictive polling.
Detailed Report
Bias Rating: LEAST BIASED (-0.7)
Factual Reporting: HIGH (1.5)
Country: USA
MBFC’s Country Freedom Rating: MOSTLY FREE
Media Type: Organization/Foundation
Traffic/Popularity: Minimal Traffic
MBFC Credibility Rating: HIGH CREDIBILITY
History
Mason-Dixon Polling is a market research company based in Washington, DC. According to their about page, “Mason-Dixon has tracked thousands of national, state, and local political races, with phenomenal accuracy. No other polling firm has its record publicly tested and validated as long and often as Mason-Dixon.”
Read our profile on the United States media and government.
Funded by / Ownership
Mason-Dixon Polling is a private company hired by numerous outlets for political polling and market research. Revenue is derived through sales of services.
Analysis / Bias
Mason-Dixon Polling conducts market research and polling via various mediums. The website does not generally report on politics and conducts research for both political parties.
Polling bias is assessed using Silver Bulletin’s mean-reverted bias metric. For Mason-Dixon, the mean-reverted polling bias is +0.50, indicating a slight Republican lean. Under MBFC’s calibrated polling bias scale, a mean bias between -0.0 and -0.5 corresponds to a polling bias score of -1. Polling bias accounts for 70% of the final bias score, while editorial bias accounts for 30%.
Applying MBFC’s weighted formula:
(+1 × 0.70) + (0 × 0.30) = +0.7
Based on MBFC’s bias classification scale, a final score of +0.7 places Mason-Dixon in the Least Biased category.
Factual reporting is rated High based on a Silver Bulletin grade of A-, indicating solid predictive accuracy and good methodological performance.
Failed Fact Checks
- None in the Last 5 years
Overall, we rate Mason-Dixon Polling as Least Biased based on polling that minimally favors the right. We also rate them as High Factual pollsters based on an A- rating in predictive polling. (D. Van Zandt 10/24/2024) Updated (02/19/2026)
Source: https://mason-dixon.com/
Last Updated on February 19, 2026 by Media Bias Fact Check
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Left vs. Right Bias: How we rate the bias of media sources