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We present a uniform mid-infrared imaging and photometric survey of 36 young,nearby, star-forming clusters and groups using {\it Spitzer} IRAC and MIPS. Wehave confidently identified and classified 2548 young stellar objects usingrecently established mid-infrared color-based methods. We have devised andapplied a new algorithm for the isolation of local surface density enhancementsfrom point source distributions, enabling us to extract the overdense cores ofthe observed star forming regions for further analysis. We have compiledseveral basic structural measurements of these cluster cores from the data,such as mean surface densities of sources, cluster core radii, and aspectratios, in order to characterize the ranges for these quantities. We find thata typical cluster core is 0.39 pc in radius, has 26 members with infraredexcess in a ratio of Class II to Class I sources of 3.7, is embedded in a$A_K$=0.8 mag cloud clump, and has a surface density of 60 pc$^{-2}$. Weexamine the nearest neighbor distances among the YSOs in several ways,demonstrating similarity in the spacings between Class II and Class I sourcesbut large member clusters appear more dense than smaller clusters. Wedemonstrate that near-uniform source spacings in cluster cores are common,suggesting that simple Jeans fragmentation of parsec-scale cloud clumps may bethe dominant process governing star formation in nearby clusters and groups.Finally, we compare our results to other similar surveys in the literature anddiscuss potential biases in the data to guide further interpretation.

A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis