Populate a whole town

@shanls96, this is the contents of the mc_settings.cfg file I use. You can just copy and paste it over yours if you'd like. You will definitely want to go in and change the default save game name for auto-save though, seeing as I doubt your household has the same last name as mine. You may also want to adjust various other settings, like lifespan durations, etc.

And don't forget when you're playing to get your sim out and go places; go to a park, a restaurant, a cafe, a lounge, etc. The game runs different routines to make new sims to populate these places, as well as to fill the various service roles, if your game doesn't already have enough sims, so visiting various types of lots will help get sims in your worlds. Then you need to be patient, and give it some time. The routines for marriage, moving, etc. only run a few times a week, not every day (unless you edit those settings too)

The mc_settings.cfg file can be found in whatever directory you have the mod in. Good luck!

{
    "Adopt_Neglected_Child": true,
    "Age_Span_Adult": 45,
    "Age_Span_Baby": 2,
    "Age_Span_Cat_Adult": "31.0,44.0",
    "Age_Span_Cat_Child": "1.0,2.5",
    "Age_Span_Cat_Elder": "12.0,14.0",
    "Age_Span_Child": 18,
    "Age_Span_Dog_Adult": "33.0,44.0",
    "Age_Span_Dog_Child": "1.0,3.5",
    "Age_Span_Dog_Elder": "9.0,14.0",
    "Age_Span_Elder": 16,
    "Age_Span_Teen": 17,
    "Age_Span_Toddler": 12,
    "Age_Span_YoungAdult": 45,
    "Allow_Teen_Parenting": false,
    "Appearance_AF_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestLift": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_AM_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestExpand": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_AgeupChangeWalkstyle": false,
    "Appearance_ApplyTemplate": "",
    "Appearance_DefaultWalkstyle_AF": "",
    "Appearance_DefaultWalkstyle_AM": "",
    "Appearance_DefaultWalkstyle_EF": "",
    "Appearance_DefaultWalkstyle_EM": "",
    "Appearance_DefaultWalkstyle_TF": "",
    "Appearance_DefaultWalkstyle_TM": "",
    "Appearance_DefaultWalkstyle_YAF": "",
    "Appearance_DefaultWalkstyle_YAM": "",
    "Appearance_EF_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestLift": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_EM_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestExpand": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_FemaleFitLimits": "-100,100",
    "Appearance_FemaleLeanLimits": "-100,100",
    "Appearance_MaleFitLimits": "-100,100",
    "Appearance_MaleLeanLimits": "-100,100",
    "Appearance_MonitorPhysique": false,
    "Appearance_ParentAppearanceVariance": 15,
    "Appearance_TF_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestLift": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_TM_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestExpand": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_UseParentAppearance": true,
    "Appearance_UseParentSkinTones": true,
    "Appearance_YAF_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestLift": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Appearance_YAM_Template": {
        "Belly": ,
        "Butt": ,
        "ChestDepth": ,
        "ChestExpand": ,
        "ChestSize": ,
        "Feet": ,
        "Hips": ,
        "LowerArms": ,
        "LowerLegs": ,
        "Neck": ,
        "Shoulders": ,
        "UpperArms": ,
        "UpperLegs": ,
        "Waist": 
    },
    "Autosave_CurrentSaveNumber": 4,
    "Autosave_Enabled": true,
    "Autosave_HexSlotNumber": "111000",
    "Autosave_IntervalAmount": 6,
    "Autosave_IntervalType": "SH",
    "Autosave_MaxSaveNumber": 10,
    "Autosave_Name": "Winters Legacy Family-",
    "Autosave_ShowConfirmation": false,
    "BB_Debug_Objects_Enabled": false,
    "BB_Free_Build_Enabled": true,
    "BB_Ignore_Unlocks_Enabled": false,
    "BB_Move_Objects_Enabled": true,
    "Bill_AmountPercentApartment": -20,
    "Bill_Amount_Percent": 25,
    "Bill_AutoPay": false,
    "Bypass_Sim_Menus": "MCCO",
    "CAS_BypassBlueBabies": false,
    "Career_AdultEmploymentRange": "70,80",
    "Career_ChildrenQuitSchool": false,
    "Career_ElderEmploymentRange": "20,35",
    "Career_FillCareerInactiveOnly": false,
    "Career_TeenEmploymentRange": "40,50",
    "Career_TeensQuitSchool": false,
    "Cleaner_BypassFamilyGhosts": true,
    "Cleaner_CleanCulled": true,
    "Cleaner_CleanPetRelationships": "N,A",
    "Cleaner_CleanRelationships": "P,C,15",
    "Cleaner_LeaveRelationshipCount": 12,
    "Cleaner_MatchGlasses": false,
    "Cleaner_RemoveItems": true,
    "Cleaner_RemoveItemsAge": "T,YA,A",
    "Cleaner_RemoveItemsGender": "M,F",
    "Cleaner_RemoveItemsSims": "N,P",
    "Cleaner_RemoveItemsType": "1:Sl.B,33:Sl.B",
    "Cleaner_SyncHouseholdNames": true,
    "Cleaner_SyncMarriedNames": true,
    "Club_BypassPlayedHouseholds": true,
    "Club_MonitorMembers": true,
    "Club_OpenMemberSlots": 1,
    "Debug_Cheats_Enabled": false,
    "Decay_Ratio_Friendship": 20,
    "Decay_Ratio_Romantic": 20,
    "Dresser_ChangeOutfitAfterCareerF": "",
    "Dresser_ChangeOutfitAfterCareerM": "",
    "Dresser_IncludeDarkFormMakeup": false,
    "Dresser_IncludeDarkFormOutfits": false,
    "Dresser_MakeupAges": "T,YA,A",
    "Dresser_MakeupGenders": "F",
    "Dresser_MakeupOutfits": "E,F,P,AT,SL,SW,C,CW,HW,SP,SI",
    "Dresser_MaximumMultipleOutfits": 5,
    "Dresser_MultipleOutfitAges": "C,T,YA,A,E",
    "Dresser_MultipleOutfitGenders": "M,F",
    "Dresser_OnlyUseSavedOutfits": true,
    "Dresser_PercentMultipleOutfits": 65,
    "Dresser_PercentUseCustomSkinTone": 0,
    "Dresser_ReplaceSituationOutfits": "",
    "Dresser_RunMakeupCheck": true,
    "Dresser_RunOnAgeUp": "TD,C,T,YA,A,E",
    "Full_Edit_CAS": false,
    "Game_Time_Speed": 35,
    "Headline_Effects_Enabled": true,
    "Hover_Effects_Enabled": true,
    "Logging_Append": false,
    "Logging_Enabled": true,
    "Marriage_AgePercentage": "3,10,30,33",
    "Marriage_AgeToRun": "A,E,YA",
    "Marriage_AllowHomeless": true,
    "Marriage_BypassActiveRomanticInterest": true,
    "Marriage_BypassPlayedHouseholds": true,
    "Marriage_DaysToRun": "",
    "Marriage_EnforceFamily": true,
    "Marriage_FlagGenderPreference": true,
    "Marriage_ManualRenameSpouses": "P",
    "Marriage_MoveFamilies": true,
    "Marriage_OccupancyType": "",
    "Marriage_RemoveServiceRoleLimit": false,
    "Marriage_RenameOppositeSex": "M",
    "Marriage_RenameSameGender": true,
    "Marriage_SameSexPercentage": 15,
    "Marriage_SpouseGenders": "M",
    "Marriage_UseSameAgeGroup": true,
    "Marriage_UseTraitsForMarriage": true,
    "Maximum_Household_Size": 8,
    "MotiveDecay_Cats": 80,
    "MotiveDecay_Dogs": 80,
    "MotiveDecay_Sims": 100,
    "MotiveDecay_Vampires": 100,
    "Occult_AbductionAges": "YA,A,E",
    "Occult_AbductionAllowNPC": false,
    "Occult_AbductionDuration": 4,
    "Occult_AbductionPregnancyAges": "YA,A",
    "Occult_AbductionPregnancyGenders": "M",
    "Occult_AbductionStartHour": 22,
    "Occult_AgePercentage": "20,25,45,15",
    "Occult_AlienFrequency": "N",
    "Occult_AlienHumanHaveAlien": 0,
    "Occult_AlienHumanHaveHybrid": 100,
    "Occult_AlienHybridHaveAlien": 0,
    "Occult_AlienHybridHaveHybrid": 100,
    "Occult_AlienPollinatorGenders": "F",
    "Occult_ForceAlienDisguiseType": "",
    "Occult_ForceDarkform": false,
    "Occult_HybridHumanHaveAlien": 0,
    "Occult_HybridHumanHaveHybrid": 100,
    "Occult_HybridHybridHaveAlien": 0,
    "Occult_HybridHybridHaveHybrid": 100,
    "Occult_MaximumAliens": 5,
    "Occult_MaximumVampires": 12,
    "Occult_RiskyVampNeedCreation": true,
    "Occult_RiskyVampNotification": true,
    "Occult_RiskyVampPercentages": "0,0,0,25",
    "Occult_TimeBetweenAbductions": 24,
    "Occult_UseCustomPregnancy": true,
    "Occult_VampireExpAdjustment": 0,
    "Occult_VampireMaximumAge": "A",
    "Occult_VampireOffspringPercent": 50,
    "Occult_VampireSkillOnAgeUp": true,
    "Pause_on_Zone": true,
    "Pay_Child_Support_Percent": 1,
    "Pay_Child_Support_Type": "U",
    "Population_AllowHomelessMoveIn": true,
    "Population_AllowNoClowns": false,
    "Population_AllowStrayMoveIn": true,
    "Population_BarNights": "GU,LA,SI",
    "Population_BypassCulling": false,
    "Population_BypassPlayedHouseholds": true,
    "Population_DisableImmortalSims": "",
    "Population_EnforceVampireHomes": true,
    "Population_HomelessApartmentPercent": 100,
    "Population_MaxSimsInZone": 30,
    "Population_MaximumHomeless": 75,
    "Population_MoveOutEldersType": "NA",
    "Population_MoveOutSingleSim": true,
    "Population_NumAdjustLot": "GYM,LIB,LOU,BAR,CAF,CHA,CLU,DAN,PAR,SPA,POL,ART,KAO,MYS,WBY",
    "Population_OpenHouses": 1,
    "Population_PercentAdult": 33,
    "Population_PercentBaby": 25,
    "Population_PercentChild": 25,
    "Population_PercentElder": 5,
    "Population_PercentMale": 45,
    "Population_PercentToddler": 25,
    "Population_RandomLimitHouseholdType": "A",
    "Population_RandomUseTrayGenderSet": true,
    "Population_RandomUseTrayOutfits": true,
    "Population_RandomUseTraySimPercent": 85,
    "Population_RandomizeVisitingSims": true,
    "Population_ReaperStopStalking": false,
    "Population_RunDresser": true,
    "Pregnancy_AdoptionAges": "B,TD,C,T",
    "Pregnancy_AdoptionPercentMale": 45,
    "Pregnancy_AgePercentage": "2,10,15,0",
    "Pregnancy_AgeToRun": "A,YA,T",
    "Pregnancy_AgeWhenPregnant": false,
    "Pregnancy_AllowAffairs": true,
    "Pregnancy_AllowHomeless": true,
    "Pregnancy_AllowMalePregnancy": "N",
    "Pregnancy_AutoMarryPercent": 66,
    "Pregnancy_BabyMotiveDecay": 80,
    "Pregnancy_BypassActiveRomanticInterest": true,
    "Pregnancy_BypassPlayedHouseholds": true,
    "Pregnancy_DaysToRun": "",
    "Pregnancy_Duration": 4,
    "Pregnancy_EnforceFamily": true,
    "Pregnancy_FlagGenderPreference": true,
    "Pregnancy_IdenticalOffspringChance": 40,
    "Pregnancy_InsiminateGenders": "M",
    "Pregnancy_MaxHouseholdChildren": 4,
    "Pregnancy_MaxOffspring": 3,
    "Pregnancy_NameInactiveAdoption": "A",
    "Pregnancy_NameInactiveOffspring": "A",
    "Pregnancy_OccupancyType": "PH",
    "Pregnancy_OffspringGender": "M,F",
    "Pregnancy_OffspringTraitsMax": 3,
    "Pregnancy_OffspringTraitsType": "R",
    "Pregnancy_OnlyMarriedPregnancy": false,
    "Pregnancy_OppositeSexAdoptionPercent": 5,
    "Pregnancy_PauseOnPlayableLabor": true,
    "Pregnancy_PetAgePercentage": "20,20",
    "Pregnancy_PetAgeToRun": "A",
    "Pregnancy_PetAllowHomeless": true,
    "Pregnancy_PetMaxHouseholdChildren": 3,
    "Pregnancy_PetMaxOffspring": 3,
    "Pregnancy_PetPartnerAge": "A",
    "Pregnancy_SameSexAdoptionPercent": 20,
    "Pregnancy_SameSexPercentage": 50,
    "Pregnancy_SyncChildSurname": true,
    "Pregnancy_UseSameAgeGroup": false,
    "Pregnancy_UseTraitsForPregnancy": true,
    "Put_Away_Books_Fix": true,
    "RelationshipCullingType": "C",
    "Relationship_BreakupMarriagePercent": 15,
    "Relationship_BreakupMoveoutOffspring": 50,
    "Relationship_BreakupMoveoutSim": 3,
    "Relationship_BreakupPercent": 25,
    "Show_AgeUpNotificationType": "AF",
    "Show_BirthNotificationDetails": true,
    "Show_BirthNotificationType": "AF",
    "Show_Cheats_Menu": true,
    "Show_Computer_Menu": true,
    "Show_DeathNotificationType": "AL",
    "Show_MarriageNotificationType": "AF",
    "Show_MovingNotificationType": "AF",
    "Show_NPCBirthdayNotifications": true,
    "Show_Notifications": true,
    "Show_PetDeathNotificationType": "P",
    "Show_PetPregnancyNotificationType": "P",
    "Show_PregnancyNotificationType": "AF",
    "Show_RelChangeNotificationType": "AF",
    "Show_Sim_Menu_Type": "A",
    "Silence_Phone_Texts": "A",
    "Sim_Death_Only_On_Lot": true,
    "Skill_Difficulty_Adjustment": 0,
    "Testing_Cheats_Enabled": false,
    "Tuner_AllowMonsterUnderBed": true,
    "Tuner_AllowMoodDeath": false,
    "Tuner_AllowMultipleBFFs": true,
    "Tuner_AllowTeenAskMoveIn": true,
    "Tuner_ArchiveInteractions": false,
    "Tuner_AutoClean": true,
    "Tuner_AutoFlirty": false,
    "Tuner_AutoMarriage": false,
    "Tuner_AutoMean": true,
    "Tuner_AutoMischief": true,
    "Tuner_AutoProposal": false,
    "Tuner_AutoRepair": true,
    "Tuner_DisableWitnessDeath": false,
    "Tuner_FriendlyAskSingle": true,
    "Tuner_FriendlyStayNight": true,
    "Tuner_KissesAlwaysAvailable": false,
    "Tuner_MaximumArchive": 25,
    "Tuner_StopRandomFlirting": true,
    "Woohoo_AllowFamily": false,
    "Woohoo_AllowNoStrings": false,
    "Woohoo_AllowPolygamy": false,
    "Woohoo_AllowTFB": true,
    "Woohoo_AllowTeens": false,
    "Woohoo_AutonomousMinRestTime": 6,
    "Woohoo_AutonomousTryForBaby": false,
    "Woohoo_AutonomousWoohoo": true,
    "Woohoo_BedSharing": false,
    "Woohoo_BirthControlAllMoods": true,
    "Woohoo_BirthControlDuration": 4,
    "Woohoo_DisableJealousy": false,
    "Woohoo_ElderTryForBaby": false,
    "Woohoo_ExtremeWoohoo": false,
    "Woohoo_NudeInHotTub": true,
    "Woohoo_NudeInSauna": true,
    "Woohoo_NudeSpa": true,
    "Woohoo_NudeWoohoo": true,
    "Woohoo_NudeWoohooGender": "F,M",
    "Woohoo_NudeWorkout": false,
    "Woohoo_NudeYoga": false,
    "Woohoo_NudityAges": "YA,A,T,E",
    "Woohoo_OppositeSexPregnantSim": "F",
    "Woohoo_RemainNude": true,
    "Woohoo_RiskyWoohooPercent": 5,
    "Woohoo_SameSexPregnantSim": "T",
    "Woohoo_SameSexTryForBaby": false,
    "Woohoo_SleepyWoohoo": false,
    "Woohoo_TryForBabyPercent": 75,
    "Woohoo_UseFertileInRisky": true,
    "Woohoo_UsePrivacy": true,
    "Woohoo_UseWoohooSkill": false
}