Classification of county

Offical name of ccounty and a 2-digit code. Eaquals NUTS-3 in european statistics. --- Objective: County is a regional administrative unit both for national and county activity and an important unit in the publication of statistics.官方县名及2位代码，等效于欧洲统计体系中的NUTS-3（Nomenclature of Territorial Units for Statistics）级行政区划。 --- 【数据集目标】县作为区域性行政单元，既承担国家与县域层面的行政事务，亦是统计数据发布环节的核心统计单元。