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A technique is described that permits the robust decomposition of the bulgeand disk components of a sample of Seyfert galaxies, as well as a (control)sample of non-active galaxies matched to the Seyferts in the distributions ofredshift, luminosity and morphological classification. The structuralparameters of the host galaxies in both samples are measured. No statisticallysignificant differences at greater than the 95% level are found in theseparameters according to a K-S test.  ``Companion galaxies'' --- defined as any galaxy within a projectedseparation of 200 h^{-1} kpc from the center of the host --- are identified andtheir basic properties measured. A comparison between the active and controlsamples in the distributions of apparent R magnitude, absolute R magnitude(assuming the ``companions'' are at the distance of the host), projectedseparation from the host, position angle relative to the host, magnitudedifference between the companion and host, and strength of the tidal parameter,show no statistically significant differences.  Similarly, no statistically significant differences are found between thecontrol and active sample host galaxies in terms of light asymmetries --- bars,rings, isophotal twisting, etc. The implications for a model in whichinteractions and mergers are responsible for inciting activity in galacticnuclei are discussed briefly.Comment: 19 pages, 9 tables and 9 figures (separate from paper). Accepted for  publication in AJ (October 2000

A CCD Study of the Environment of Seyfert Galaxies. III. Host Galaxies and the Nearby Environments