Aims: Knowledge about the women reached by public family planning services is scarce. The means for provision of these services that are pivotal for women’s health and empowerment varies globally. In Finland, family planning services are offered free of charge, but often separately for different age groups. City of Vantaa offers these services for all female residents without age limit. The aim of this study was to describe the characteristics of the women using public family planning services. Methods: We assessed the sociodemographic and reproductive characteristics of women aged 15–44 using ( n = 11,790) and not using ( n = 42,931) these services in 2013–2014. We obtained adjusted odds ratios (AORs) and 95% confidence intervals (95%CIs) for service use by multivariate logistic regression. Results: Women under 35 years of age had higher odds of service use compared with those over 35 (AORs ranging from 2.79 [95%CI 2.54–3.07] for 15–19 year-olds to 1.81 [95%CI 1.69–1.95] for 30–34 year-olds). Women speaking a foreign native language used services less when aged under 30 and more when aged 35–44 compared with women speaking the national languages. Women with a history of delivery, induced abortion or sexually transmitted infections, or with a lower socioeconomic or educational status were more likely to use the services. Conclusions: Young women in general were more likely to use free-of-charge family planning services. In contrast, young women speaking a foreign native language were underrepresented among service users. It is important to recognise and actively reach underrepresented groups, such as young women with a foreign background, to optimise equal access to family planning services.