NY 47 was referred to as the Rochester Outer Loop (or Outer Loop) in contrast to the Inner Loop around downtown Rochester. This moniker remains in use to this day, now referring to the designations that have since replaced NY 47 along the expressway portions. Conceptually, NY 104 completes the Outer Loop along the north side of the city. However, only the section east of the Genesee River is expressway, leaving NY 104 from modern NY 390 to the Veterans Memorial Bridge as the only at-grade portion of the loop.
Off the expressway and now at-grade, NY 47 turned north onto NY 383, forming a short concurrency with NY 383 into Rochester. At Elmwood Avenue, NY 47 and NY 383 departed Scottsville Road and proceeded eastward on Elmwood. Two blocks to the east, at an intersection with South Plymouth Avenue, NY 383 split from NY 47, following Plymouth into downtown Rochester. NY 47 remained routed on Elmwood, crossing the Genesee River and passing north of Strong Memorial Hospital prior to intersecting NY 15 (Mount Hope Avenue) in the shadow of Mount Hope Cemetery. East of NY 15, NY 47 progressed along Elmwood, intersecting several local streets before entering Brighton.
Within Brighton, NY 47 continued on Elmwood Avenue through "Twelve Corners", intersecting NY 31 (Monroe Avenue) at the location, to what is now Interstate 590. At the northbound entrance ramp of the modern I-590/Elmwood Avenue interchange, NY 47 separated from Elmwood, entering the freeway. While what is now I-590 was constructed and open from Winton Road to I-490, it had no signed designation between Winton and Elmwood.
When NY 47 was first commissioned in the Rochester area between 1935 and 1938, it was routed along previously unnumbered roadways, with its northwest terminus located at the intersection of NY 31 (Lyell Avenue) and Howard Road in Gates. NY 47 took Howard Road south, passing through Gates Center and intersecting NY 33 before crossing the then-New York Central Railroad main line (now the CSX Rochester Subdivision) at-grade. The route remained on Howard Road until the intersection of Howard Road and Chili Avenue (NY 33A), which also included Brooks Avenue at this juncture of time. NY 47 then turned east onto Brooks Avenue toward the Greater Rochester International Airport, joining the current routing of NY 204 at Beahan Road (now Old Beahan Road).
NY 47 followed the entire alignment of NY 204 to what is now Interstate 390 and continued on Brooks Avenue into Rochester to Genesee Park Boulevard. Route 47 turned south onto the street, which circles around the southwestern quadrant of the city, and followed its length to Genesee Street, where it turned south for a short distance before resuming its eastward alignment on Elmwood Avenue. The route remained on Elmwood into Brighton, where it turned north onto South Winton Road at Twelve Corners. At Highland Avenue, NY 47 reentered Rochester and became North Winton Road at East Avenue (NY 96). The route remained on Winton through Rochester and Irondequoit before terminating at Empire Boulevard (then U.S. Route 104, now NY 404) just west of Irondequoit Bay.
East of Howard Road, construction was underway on a new limited-access highway paralleling NY 47 between NY 31 and NY 33 by 1962. Within two years, work had begun on an extension of the highway south along the Erie Canal to Scottsville Road. Farther east, construction was underway on a new highway leading south from I-490 to Elmwood Avenue east of Twelve Corners. The entirety of both highways were opened as part of a realigned Route 47 c. 1965. As part of the realignments, NY 47, which now began a half-mile (0.8 km) to the east of Howard Road at modern NY 390 exit 21, was rerouted to follow Elmwood Avenue east from Twelve Corners to what is now Interstate 590 exit 3 while the overlap with NY 383 was truncated on its western end to current Interstate 390 exit 17. In Rochester, NY 47 was extended south on the Sea Breeze Expressway to the Can of Worms, where it overlapped I-490 before continuing southward on modern I-590 through Brighton.
NY 47 was officially extended on both ends on January 1, 1970, to terminate at Lake Ontario on opposite sides of Rochester. In Greece, the designation officially followed what is now NY 390 north to the Lake Ontario State Parkway; however, the portion between US 104 and the parkway had yet to be constructed. To the east in Irondequoit, NY 47 was stretched northward along the Sea Breeze Expressway to Culver Road, resulting in overlaps with both US 104 and NY 18. At the time, the overlap with US 104 existed only between Empire Boulevard and the Keeler Street Expressway, which became the new alignment of the route through Irondequoit after its completion in 1969. The overlap with US 104 was eliminated entirely the following year when the route was rerouted between NY 47 and Webster onto a new expressway alignment traversing Irondequoit Bay via the newly built Irondequoit Bay Bridge. By 1976, NY 18 had been truncated to its current eastern terminus in Kodak Park and US 104 had been redesignated as NY 104.
Off the expressways, the former alignments of NY 47 now carry several designations. Howard Road, bypassed by the 1960s realignment in Greece, is still maintained by the New York State Department of Transportation as New York State Route 940L, an unsigned reference route in length. Beahan Road, also bypassed by the same 1960s rerouting, was reconfigured into its current alignment by 1971 due to an expansion by the airport. All of Beahan Road, including the portion north of the Rochester and Southern Railroad grade crossing that carried NY 47, is currently maintained by Monroe County as County Route 164. The portion of NY 47 on Elmwood Avenue from the Rochester city line to I-590, as well as the remainder of Elmwood Avenue east to NY 96, is also maintained by Monroe County as County Route 87. Lastly, the segments of Winton Road outside of the Rochester city limits are now County Route 98, a designation that extends south past Twelve Corners to the southern end of Winton Road in Henrietta. The remainder of circa-1980 NY 47 and the former alignments of the route are currently locally maintained.