The need of this paper came as a realization that literature are extensive on the contribution of urban informal
enterprises to nation economy without given adequate attention to its associated negativities on sociocultural
environment. Against this background, the paper analyses the perception of residents on environmental impacts
of Urban Informal Enterprises in Ibadan Nigeria. Using systematic sampling technique, a total number of one
thousand, six hundred and thirty eight (1638) questionnaire were administered to residents in low medium and
high residential quarters. An interval of 2 was used to select residential unit in each quarter. Six indices were
developed and Likert scale rating was used to measure resident’s perception on the effects of UIES on the
environment. The average weight of such gave each index and this was subjected to Correlation Analysis to
examine the effects and relationship between UIEs and indices on perceived environmental effects. The result of
analysis show that the way operators dispose their waste makes the environment dirty. This recorded highest
agreement index of RAI 4.14, followed by waste from UIE litters the streets (RAI 4.12) and deface the
environment (RAI 3.90), high level of noise from operators (RAI 3.85), waste releases offensive odor (RAI 3.78)
shops built on open spaces disturb flow of water (RAI 3.69) and also block drainage channel (RAI 3.60) The
result of correlation analysis reveals that physical characteristic index (PCI), behavioral characteristic index
(BCI), environmental characteristic index (ECI), land use characteristic index (LUCI), and economic
characteristic index (ECCI) have impact on the environment. This supports the observed negativities associated
with the subject on the environment. The paper therefore recommends formulation of policies and legislative
measures that will cater for proper waste management from this sector. This will further promote sustainability
of Nigerian cities.