Resumen: In this paper we want to test whether the choice of different types of urban data for the same country exerts an influence or not on the selection of the best parametric density function (among the Pareto, truncated lognormal, the double Pareto lognormal and mixtures of lognormals) to describe the city size distribution. We have employed four different definitions of city for Spain. We have concluded that the outperforming density is different for each type of data. Idioma: Inglés DOI: 10.1016/j.econlet.2020.109643 Año: 2020 Publicado en: ECONOMICS LETTERS 197 (2020), 109643 [3 pp] ISSN: 0165-1765 Factor impacto JCR: 2.097 (2020) Categ. JCR: ECONOMICS rank: 171 / 376 = 0.455 (2020) - Q2 - T2 Factor impacto SCIMAGO: 0.843 - Finance (Q1) - Economics and Econometrics (Q1)