Shotgun metagenomic approaches are capable of concomitantly characterizing novel insect-associated viruses while simultaneously allowing for detection of known viruses of public health concern. Using Illumina next-generation shotgun sequencing and novel sampling methods to demonstrate the suitability of metagenomic approaches for virus discovery and surveillance, herein we generate a catalog of known and novel viruses found in various New Jersey mosquito species. We first sampled mosquito excreta collected via a novel superhydrophobic collection device to reconstruct viral genomic information from mosquito-associated viruses, yielding a diverse repertoire of novel viral genotypes that include human pathogens. To further investigate the tissue tropism of mosquito-associated viruses, and to assess those that may be transmitted to the host via blood feeding, we compared the viral diversity in individual mosquito saliva, salivary glands, midguts, and excreta – four sample types relevant to internal barriers of infection. In addition to expanding the catalog of mosquito-associated viruses and further, the mosquito holobiont, our results highlight many viral lineages that are closely related to those described from a broad diversity of species and geographic locales. The apparent cosmopolitan nature of these associated viruses in conjunction with the rapid global expansion of many mosquito species begs the question: “Is everything everywhere”?